Samsung pro 850 2tb ssd

850 Pro 2TB

The number of benchmark samples for this model as a percentage of all 18,073,251 SSDs tested.

850 Pro 2TBSamsung  £949Bench 107%, 1,158 samples1x
EDIT WITH CUSTOM PC BUILDER Value: 30% - Poor Total price: £1,694
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Samsung 850 EVO, PRO 2TB Review

Generally when I talk to people about SSDs and how great they are, two concerns almost always pop up. The first concern of course is cost. While cost has been getting more and more competitive in the past few years, SSDs are still relatively expensive compared to HDDs.  The second concern is capacity. Whereas HDD capacities practically start at 500GB to 1TB, SSDs generally cap out at 512GB or 1TB. That said, whereas it was almost impossible to find SSDs under the ~$0.50/GB pricepoint just two years ago, it’s relatively easy to find drives down in the ~$0.30/GB pricepoint today. In the next few years, prices are expected to continue to drop as NAND density increases which should not only lead to higher capacity SSDs, but also lead to price parity with HDDs sometime in the future.

Since cost and capacity have always been some of the biggest concerns, we always raise these concerns with the SSD vendors whenever we get a chance. As such, we learned back at CES that Samsung had the capability of producing 2TB SSDs, but at the time the cost would be prohibitively expensive to sell to the mass market. With Samsung’s 3D V-NAND process now mature, stable, and cost effective enough for mass market production, Samsung is releasing both their 850 EVO and 850 PRO SSDs at the 2TB capacity.

Samsung 850 EVO Specifications

Manufacturer Model Form Factor Capacity Controller NAND Sequential Reads Sequential Writes 4K Random Read 4K Random Write Interface Endurance Warranty
Samsung Samsung Samsung Samsung Samsung
850 EVO 850 EVO 850 EVO 850 EVO 850 EVO
2.5″ 7mm 2.5″ 7mm 2.5″ 7mm 2.5″ 7mm 2.5″ 7mm
120GB 250GB 500GB 1TB 2TB
Samsung MGX Samsung MGX Samsung MGX Samsung MEX Samsung MHX
Samsung 32-layer TLC 3D V-NAND Samsung 32-layer TLC 3D V-NAND Samsung 32-layer TLC 3D V-NAND Samsung 32-layer TLC 3D V-NAND Samsung 32-layer TLC 3D V-NAND
540 MB/s 540 MB/s 540 MB/s 540 MB/s 540 MB/s
520 MB/s 520 MB/s 520 MB/s 520 MB/s 520 MB/s
94,000 97,000 98,000 98,000 98,000
88,000 88,000 90,000 90,000 90,000
SATA 3 6GB/s SATA 3 6GB/s SATA 3 6GB/s SATA 3 6GB/s SATA 3 6GB/s
75TB 75TB 150TB 150TB 150TB
5 Years Limited 5 Years Limited 5 Years Limited 5 Years Limited 5 Years Limited

Samsung 850 PRO Specifications

Manufacturer Model Form Factor Capacity Controller NAND Sequential Reads Sequential Writes 4K Random Read 4K Random Write Interface Endurance Warranty
Samsung Samsung Samsung Samsung Samsung
850 PRO 850 PRO 850 PRO 850 PRO 850 PRO
7mm, 2.5″ SATA 7mm, 2.5″ SATA 7mm, 2.5″ SATA 7mm, 2.5″ SATA 7mm, 2.5″ SATA
128GB 256GB 512GB 1TB 2TB
Samsung MEX Samsung MEX Samsung MEX Samsung MEX Samsung MHX
Samsung 32 layer 3D V-NAND Samsung 32 layer 3D V-NAND Samsung 32 layer 3D V-NAND Samsung 32 layer 3D V-NAND Samsung 32 layer 3D V-NAND
550 MB/s 550 MB/s 550 MB/s 550 MB/s 550 MB/s
470 MB/s 520 MB/s 520 MB/s 520 MB/s 520 MB/s
100,000 IOPS 100,000 IOPS 100,000 IOPS 100,000 IOPS 100,000 IOPS
90,000 IOPS 90,000 IOPS 90,000 IOPS 90,000 IOPS 90,000 IOPS
SATA 3 6Gb/s SATA 3 6Gb/s SATA 3 6Gb/s SATA 3 6Gb/s SATA 3 6Gb/s
150 TBW 150 TBW 300 TBW 300 TBW 300 TBW
10 Years 10 Years 10 Years 10 Years 10 Years

For the new 2TB Samsung 850 EVO and 850 PRO, most of the drive is actually very similar to their lower capacity cousins. For the Samsung 850 EVO, it’ll be using Samsung’s 3-bit MLC 3D V-NAND while the Samsung 850 PRO will be using Samsung’s 2-bit MLC 3D V-NAND. No surprises there. The biggest change compared to the lower capacities is Samsung’s introduction of a new Samsung MHX controller which will support capacities up to 2TB.

Performance on the Samsung 850 EVO is rated at up to 540/520 MB/s sequential reads/writes and 98,000/90,000 IOPS 4K random reads/writes. Performance on the Samsung 850 PRO 2TB is rated at up to 550/520 MB/s sequential reads/writes and 100,000/90,000 IOPS 4K random reads/writes.

Warranty on the drives are still unchanged at 5 years, 150TBW on the Samsung 850 EVO while the Samsung 850 PRO 2TB gets 10 years, 300TBW.

Let’s take a closer look.

Here’s a look at the packaging for the Samsung 850 EVO 2TB.

Included is some documentation along with the drive itself.

The 7mm, 2.5″ chassis is the same design as we’ve seen for the rest of the Samsung 850 EVO lineup.

Surprisingly, the Samsung 850 EVO 2TB only uses a 3/4 sized PCB despite carrying a whopping 2TB capacity. This suggests that with a full size PCB and a new controller, Samsung could easily go even higher on the capacities.

The controller on the Samsung 850 EVO 2TB is the Samsung MHX (S4LP052X01-8030) which is a new controller designed for the 2TB Samsung 850 EVO and 850 PRO. Aside with some firmware improvements, the biggest change here is that the controller supports up to 2GB of DDR3, which will allow for capacities up to 2TB.

NAND onboard the Samsung 850 EVO 2TB is Samsung’s 3-bit MLC (TLC) 3D V-NAND. There’s only a total of 8 NAND packages onboard so each package contains 256GB NAND for a total of 2048GiB. There’s also 2GB of Samsung DDR3 which serves as the onboard DRAM buffer.

Here’s a look at the packaging for the Samsung 850 PRO 2TB.

Included is some documentation and the drive itself.

The Samsung 850 PRO 2TB uses the standard 7mm, 2.5″ casing similar to the rest of the Samsung 850 PRO lineup.

Just like what we saw with the Samsung 850 EVO 2TB, the Samsung 850 PRO 2TB only utilizes a 3/4 sized PCB.

The controller onboard the Samsung 850 PRO 2TB is the same Samsung MHX controller (S4LP052X01-8030) found on the Samsung 850 EVO 2TB.

NAND onboard is Samsung’s 2-bit per cell MLC V-NAND. Onboard there are a total of 8 NAND packages so each package contains 256GB NAND for a total of 2048GiB. Samsung also includes 2GB of Samsung DDR3 which serves as the onboard DRAM buffer.

Special thanks to CyberPowerPC, Kingston, OCZ Storage Solutions and HSPC for sponsoring our test bench!

Crystal Disk Info

Samsung 850 EVO 2TB

Today we’ll be reviewing the Samsung 850 EVO 2TB with firmwre EMT01B6Q.

Samsung 850 PRO 2TB

We’ll also be reviewing the Samsung 850 PRO 2TB with firmware EXM02B6Q.

ATTO Disk Benchmark is one of the industry’s oldest and most popular benchmarks for testing disk read/write speeds. This benchmarks allows read and write testing using predefined block sizes and gives us a good idea of read/write speeds with different sized files. Most SSD manufacturers prefer using this benchmark when advertising SSDs as it tests using compressible data, which tends to yield best performance.

Samsung 850 EVO 2TB

Samsung 850 PRO 2TB

Performance Analysis

In ATTO Disk Benchmark, performance from both the Samsung 850 EVO 2TB and the Samsung 850 PRO 2TB were extremely impressive. Sequential read performance for the Samsung 850 EVO 2TB was able to reach nearly 545MB/s while sequential read performance for the Samsung 850 PRO 2TB was able to reach nearly 560MB/s. Sequential write performance on both drives reached ~535MB/s.

AS SSD Benchmark

AS SSD is a very commonly used benchmark used to measure SSD performance in sequential, 4K, 4K QD64 and latency. Tests are run using 100% incompressible data. AS SSD also outputs a final score at the conclusion of the test based off the overall performance of the drive.

Additionally, we also run AS SSD’s included compression benchmark which tests the drive using data of varying compressibility. Some SSDs such as SandForce based SSDs tend to perform significantly better when the data is compressible.

Samsung 850 EVO 2TB

Samsung 850 PRO 2TB

Performance Analysis

AS SSD performance on both drives proved to be not only similar, but very good as well. Samsung does an extremely good job on low queue depth performance which is most representative on client workloads. Data compression does not appear to affect drive performance at all.

Crystal Disk Mark 3.0.1 x64

Crystal Disk Mark is another popular benchmark which allows us to measure both sequential read/write speeds as well as random read/write speeds. With this benchmark, tests can be run using both random fill (incompressible data) and 0 fill (compressible data). Realistically in typical computer usage scenarios, data being transferred will consist of a mixture of both incompressible and compressible data.

Samsung 850 EVO 2TB

Samsung 850 PRO 2TB

Performance Analysis

Crystal Disk Mark confirms the performance we saw from ATTO Disk Benchmark and AS SSD. With version 4.1.0 of Crystal Disk Benchmark, we also get QD32 sequential performance, which will give us maximum sequential performance.

The PC Mark 7 storage benchmark is a trace based benchmark that evaluates the SSD under many different real world environments such as gaming, multimedia editing, etc. PC Mark 7 uses a relatively light workload, which represents a typical mainstream client storage sub-system workload.

As of June 2015, we’ve also changed our comparison charts to use the PC Mark 7 Raw Secondary Storage Score. The raw score more effectively highlights performance differences between drives as it discounts idle time between tests.

Samsung 850 EVO 2TB

Samsung 850 PRO 2TB

Performance Analysis

In PC Mark 7, both the 2TB Samsung 850 EVO and Samsung 850 PRO performed extremely well, topping the charts as the fastest SATA drives on the market.

PC Mark 8 Expanded Storage Benchmark

With the introduction of PC Mark 8 2.0.228, Futuremark added the option for an Expanded Storage Benchmark which is literally designed to bring any storage system its absolute limits. The new PC Mark 8 Expanded Storage Benchmark takes around 24 hours to run and for our purposes, we’ll be using the consistency test which measures performance consistency, degradation tendency, and recovery speed of a storage system.

Consistency Test

Full details on the consistency test can be found in the PC Mark 8 Technical Guide here. For the more simplified version, the test is basically a near 24 hour, five phase benchmark – three of which we’ll be reporting on in our results below.

  • Phase 1 is a precondition phase designed to “dirty” the drive with random data. The entire drive is filled twice to the capacity of the drive.
  • Phase 2 is a degrade phase where the drive is hammered with tons of random data followed by a performance test run. This is done 8 times.
  • Phase 3 is the steady state phase where the drive is once again hammered with tons of random data followed by a performance test run. This is done 5 times.
  • Phase 4 is the recovery phase where the drive is given 5 minutes to rest followed by a performance test run. This is done 5 times.
  • Phase 5 is the clean up phase where the drive is simply secure erased.

Performance Analysis

In the significantly heavier PC Mark 8 expanded storage benchmark, the Samsung 850 EVO 2TB performed extremely well, significantly outperforming its lower capacity cousin. This is more than likely due to the much larger TurboWrite cache, which allows the Samsung 850 EVO 2TB to sustain high performance writes for a much larger amounts of data. The Samsung 850 PRO on the other hand provided worse performance than was expected, getting significantly outperformed by its lower capacity cousin as well as the Samsung 850 EVO 2TB.

FIO, which stands for Flexible I/O Tester, is basically what its name says – a flexible I/O tester / I/O workload generator. Whereas all the benchmarking tools we’ve used previously are fantastic, easy to use benchmarking tools that provide a good snapshot of SSD performance, they do lack a lot of versatility, especially for more complex and in-depth operations such as custom queue depths, block sizes, test run times, etc. While the testing that follows may not pertain to typical consumer usage, they do help give us a much more in-depth look at each individual product’s strengths and weaknesses when they’re pushed to the limits.

FIO – FOB (Fresh Out of the Box) Testing

When SSDs are brand new and Fresh Out of the Box, they’re generally able to perform at or outperform their advertised speeds, but unlike traditional hard drives, performance on SSDs begin to degrade over time as they become more and more used. This is because while SSDs are new, all bits on the SSD are empty, so they can instantly be programmed with data. However, once data gets programmed in, even if it’s deleted in the filesystem the actual data will still stay programmed on the NAND itself unless some sort of garbage collection routine comes in to wipe the data. Unfortunately, in order to write new data onto “dirty” NAND, the NAND first needs to go through an erase cycle to erase the old data before a program cycle can happen to program new data, which as you may imagine takes more time than just a simple program cycle. As this only happens when writing new data onto the SSD, you’ll generally see less performance degradation on reads and more performance degradation on writes.

For our FOB testing, we run a secure erase on the SSD then run each test sans any preconditioning. This will provide us with the highest level of performance the SSD is capable of and is likely never to be seen ever again once the SSD goes into a used state.

Our testing will include 4K read testing, 4K write testing, and 4K 70/30 read/write mix testing at queue depths of 1,2,4,8,16,32,64,128,256. The reason we’ve also included 4K 70/30 read/write mix testing is simply because most real world workloads will always fall somewhere between 0% write and 100% write rather than one or the other. Since client usage is much more read heavy, we’ll be using the 70/30 read/write mix.

For general client usage, performance will fall somewhere between queue depths of 1-4 whereas servers and other enterprise applications will easily see queue depths of 32 or greater.

Performance Analysis

Fresh out of the box, 4K random read and write performance across both 2TB Samsung SSDs are nearly identical. Both drives were just short of 100,000 IOPS 4K random reads and 90,000 IOPS 4k random writes. Mixed 4K read/write performance was excellent as well with both drives easily reaching 95,000 IOPS.

After prolonged use of an SSD, it will reach “steady state” where performance levels off to a minimum level. The FOB state is the “best case scenario” for SSD performance while “steady state” is going to be your worst.  Here, we ran the exact same set of benchmarks we just completed in the FOB state; except this time around, we’ll be preconditioning the drive by filling 100% of the drive’s LBAs with two sequential passes of 128k data followed by hammering the drive for six hours with 4K random data prior to actual testing.

Performance Analysis

Steady state performance on both the Samsung 850 EVO 2TB and PRO 2TB were very good although it does seem that the higher capacities are slightly slower at the lower queue depths. That being said, both drives were able to reach 98,000 IOPS 4K random reads and 8,500 IOPS 4K random writes. Mixed workload performance maxed out at 25,000 IOPS.

Another one of the benefits of testing with FIO is the flexibility of running consistency tests, which is one of the most important metrics when considering SSDs going forward. Looking at the results of our benchmarks such as ATTO Disk Benchmark and Crystal Disk Benchmark, we can see that practically every top tier SSD is capable of saturating SATA 6Gb/s in the FOB state. However, what really differentiates these SSDs is their ability to hold a certain level of performance even after extended periods of use.

For our consistency testing, we used a fairly standard method, which includes both filling up 75% of capacity as well as 100% capacity twice with sequential 128k data followed by the actual test itself, which is simply running 4K random writes at a queue depth of 32. By recording the IOPS every second for 2,000 seconds, we’re able to get a good look at what kind of performance can be expected when the drive is relatively new, when it’s heading towards steady state, and when it’s actually in steady state.

Performance Analysis

Performance consistency on both the Samsung 850 EVO 2TB and the Samsung 850 PRO 2TB were among the best we’ve seen once the drives reach steady state. Additionally, thanks to the significantly larger TurboWrite cache on the Samsung 850 EVO 2TB, performance between the Samsung 850 EVO 2TB and the Samsung 850 PRO 2TB were quite similar.

Another metric that’s becoming increasingly important in SSDs is its ability to keep latency low despite being subjected to a heavy workload. Even if a SSD were capable of ultra high and ultra consistent IOPS performance, if latency were high, users would still feel that the drive is slow. Ideally, SATA SSDs should always be capable of latencies under 50ms, even during heavy workloads.

For latency testing, we’ll be using the exact same testing parameters as IOPS consistency testing, except instead of recording IOPS every second, we’ll be recording latency.

Performance Analysis

Latency on the Samsung 850 EVO 2TB and the Samsung 850 PRO 2TB was excellent as well with both drives coming in at under 20ms. Latency on these large capacity drives are even lower than the latencies reported on the lower capacity drives.

In addition to testing 4K random write consistency, we’ll also test for 128K random write consistency to see how well a SSD is able to hold itself to a level of performance when getting hammered with larger file transfers.

Testing methodology is very similar to our testing for 4K random write consistency. We use a fairly standard method, which includes both filling up 75% of capacity as well as 100% capacity twice with sequential 128k data followed by the actual test itself, which is running 128K random writes at a queue depth of 32. By recording the IOPS every second for 2,000 seconds, we’re able to get a good look at what kind of performance can be expected when the drive is relatively new, when it’s heading towards steady state, and when it’s actually in steady state.

Performance Analysis

128K write consistency on the Samsung 850 EVO 2TB and the Samsung 850 PRO 2TB were slightly worse than the lower capacity drives, but they’re still very good among competing SATA SSDs. The higher capacity and larger amounts of overprovisioning however does help significantly in maintaining performance for a much longer period of time before performance degrades into steady state.

Previously, our power consumption analysis only tested for idle and maximum load power consumption, but we felt that this was a bad way to accurately measure power consumption. The reason for this is because SSDs tend to be bursty while in operation and will spike in power usage, but only for very short periods of time. As such, many of our SSDs appeared to have even higher power consumption than traditional hard drives, which is untrue.

In order to better represent a drive’s power consumption, our solution was to run a test closer to the real-world and record a trace of the exact power consumption during testing. Since PC Mark 7 has been recognized by the industry as a fantastic real-world benchmark, we’ll be recording the drive’s power consumption while running the benchmark.

All tests below are measured by our B&K Precision 5491B Bench Multimeter tapped directly into the 5v line running from the power supply to the drive. All testing here is conducted with “HIPM (Host Initiated Power Management)/DIPM (Device Initiated Power Management)” enabled and “AHCI Link Power Management – Adaptive” set to 0 milliseconds for maximum power efficiency.

Performance Analysis

Power consumption on both the Samsung 850 EVO and 850 PRO 2TB drives idled at 0.06w which is a bit higher than what we saw with the lower capacity versions of those drives. Since higher capacity drives requires more power for the additional DRAM and NAND, this was expected despite the fact that Samsung is using slightly more energy efficient DDR3L memory.

Average power consumption was also quite a bit higher with the Samsung 850 EVO 2TB coming in at 0.88w in a run of PC Mark 7. The Samsung 850 PRO 2TB however averaged 0.59w which is slightly lower than what we saw with the 512GB version of the drive.

I’m not going to go into too much detail on RAPID mode as I’ve covered it in my previous reviews of the Samsung SSDs (Samsung 840 EVO, Samsung 850 PRO). RAPID is a software included in Samsung Magician that leverages unused system resources to improve performance of the storage subsystem. This mostly involves just caching data in system memory. Both the Samsung 850 EVO and the Samsung 850 PRO have access to the RAPID mode.

PC Mark 8 Expanded Storage Benchmark

In PC Mark 8’s expanded storage benchmark, it’s pretty clear where the performance gains are seen the most. Whereas drive performance in RAPID mode is slightly slower than drive performance without RAPID mode in the degrade and steady state phases which hammer the drives constantly with random, difficult to cache data, drive performance is extremely high in the recovery phase where the same test is repeated with ample time for caching inbetween.

Since we’ve already had the opportunity to review the lower capacity versions of both the Samsung 850 EVO and the Samsung 850 PRO, we already know that they’re fantastic drives. That being said, the higher capacity drives did show slightly different performance and power characteristics compared to their lower capacity cousins, so we’ll go ahead and address that here.

In terms of performance, the Samsung 850 EVO 2TB performed very well as expected. With the much larger TurboWrite cache, performance can be maintained at a high level for a much longer period of time as well which, for most client applications, will make the Samsung 850 EVO 2TB feel no different from an enthusiast SSD even when pushed for an extended period of time. The Samsung 850 PRO 2TB on the other hand had excellent performance as well and the additional capacity didn’t seem to change its performance characteristics a whole lot. That said, the Samsung 850 PRO 2TB did exhibit some strange behavior as it experienced slower performance than the 512GB version of the drive in PC Mark 8 Expanded Storage Benchmark and it did experience slower performance in certain benchmarks at lower queue depths.

Power consumption on both the Samsung 850 EVO 2TB and the Samsung 850 PRO 2TB was slightly higher as expected of a higher capacity drive. More NAND and more memory necessitates more electricity which isn’t too surprising however, idle power consumption was still extremely competitive at just 0.06w. Active power consumption while running PC Mark 7’s storage benchmark on the other hand was slightly higher than expected, but most client use of SSDs is in idle, so this isn’t a huge problem even for mobile users.

Manufacturer Model SKU Capacity Street Price Price/GB Check Price
Samsung Samsung
850 EVO 850 PRO
$797.99 $999.99
~$0.40 ~$0.50
Click Here Click Here

The Samsung 850 EVO 2TB can currently be found online for ~$797.99 (~$0.40/GB) and the Samsung 850 PRO 2TB can currently be found online for ~$999.99 (~$0.50/GB). Pricing is actually very good considering currently there are no competitors in the marketplace for a 2TB SSD.

Overall the Samsung 850 EVO and the Samsung 850 PRO are not only best in class SSDs, but they’re also the first to be readily available in the 2TB capacities for the consumer market. They have great performance, great power consumption characteristics, best in class features including TCG Opal/eDrive encryption support, and more. Those looking for 2TB capacities will find that both drives are excellent choices, but the Samsung 850 EVO 2TB clearly does stand out as the better purchase with great pricing and plenty of performance for even the most demanding client applications. Most client users will find no difference between the Samsung 850 EVO 2TB and the Samsung 850 PRO 2TB with the exception of the $200 difference in cost. Highly recommended!

Samsung 850 EVO 2TB

Samsung 850 PRO 2TB

Sample provided by: Samsung

Availability: Amazon

Samsung SSD 850 Pro review: Top-notch solid-state drive for a premium price

Editors' note: The review was updated on July 6, 2015, when the new 2TB version was released.

There are plenty of reasons to be excited about the Samsung SSD 850 Pro.

It's the first SSD on the market that uses the innovative 3D vertical NAND (V-NAND) flash memory for top performance and ultra-high endurance. It comes with a rarely seen 10-year warranty and, among other features, has a Rapid mode that further boosts its performance. What's more, it's one of the first drives available in the all-new 2TB capacity, along with its sibling the SSD 850 Evo.

Naturally, though, all of that comes at a price. Depending on the capacities, the new Samsung drive is one of the most expensive among standard SSDs, currently costing $98, $152, $255, $489 and $1,000 for 128GB, 256GB, 512GB, 1TB and 2TB respectively. (That's about £63 to £640 and AU$128 to AU$1,310 converted.) Note that the pricing for the newly released 2TB version is the suggested retail price, and its street price will likely be lower.

If you don't mind paying the premium, the Samsung delivers the best performance, highest capacity and longest warranty time currently available on the market. It's especially great for those who regularly need to write a huge amount of data to the internal drive every day. But if you're on stricter budget, the 850 Evo is cheaper, with comparable performance in many tests.

For more options on great internal drives, check out this list of top SSDs on the market.

View full gallery

The 2TB SSD 850 Pro from Samsung Josh Miller/CNET

3D memory cell strings, ultra-high endurance

The Samsung SSD 850 Pro is a standard internal drive that supports the latest SATA 3 (6Gbps) standard and will work in any instance where a regular SATA hard drive is used. Similar to most SSDs, it's 7mm thick. Like most standard drives, it's a square device that's 2.5 inches diagonally, with the standard SATA port on one of its sides. The new drive looks exactly the same as the previous 840 Pro model .

On the inside, however, the new drive is the first that brings 3D vertical NAND flash memory to SSDs, called Samsung second-gen 86-gigabit 40nm MLC V-NAND.

Traditionally, NAND flash memory cells -- the storage units on an SSD -- are placed flat on the surface of the silicon wafer, limiting the number of cells you can cram into a square inch. In the case of the Samsung drive, cells are also stacked up to 32 layers. This allows for packing significantly more memory cells in the same amount of wafer bits, which greatly increases the density. That plus Samsung's customized firmware and the improved MEX controller, allow the drive to also offer great performance and ultra-high endurance.

Endurance is the number of program-erase (P/E) cycles an SSD has before you can't write onto it any more -- read more about SSD endurance here. Samsung says you can write at least 150TB (on the 128GB and 256GB capacities) or 300TB (on the 512GB, 1TB and 2TB capacities) of data to the 850 Pro before it runs out of P/E cycles, almost twice that of the SanDisk Extreme Pro, which has an endurance of 80TB. This means most of us won't use up the drive's endurance in our lifetime.

Capacities Design Interface Controler Flash memory Included Cache Sequential Read Sequential Write Random Read Random Write Power consumption (idle) Power consumption (read | write) Endurance (Terabyte written, at least) Suggested US retail price Warranty
128GB 256GB 512GB 1TB 2TB
2.5-inch 7mm 2.5-inch 7mm 2.5-inch 7mm 2.5-inch 7mm 2.5-inch 7mm
Samsung MEX Controller Samsung MEX Controller Samsung MEX Controller Samsung MEX Controller Samsung MHX controller
Samsung 3D V-NAND 2bit MLC Samsung 3D V-NAND 2bit MLC Samsung 3D V-NAND 2bit MLC Samsung 3D V-NAND 2bit MLC Samsung 3D V-NAND 2bit MLC
256MB 512MB 512MB 1GB 2GB
550 MB/s 550 MB/s 550 MB/s 550 MB/s 550 MB/s
470 MB/s 520 MB/s 520 MB/s 520 MB/s 520 MB/s
2mW 2mW 2mW 2mW 2mW
3.3W | 3.0W 3.3W | 3.0W 3.3W | 3.0W 3.3W | 3.0W 3.3W | 3.0W
150TB 150TB 300TB 300TB 300TB
$130 $230 $430 $730 $1,000
10-year 10-year 10-year 10-year 10-year

Helpful software, improved Rapid mode

As with the 840 Pro and 840 Evo , the 850 Pro allows you to manage all of its features via the Samsung Magician software, which is currently only available for Windows.

For example, you can use the software to turn on or off encryption, over-provisioning -- a feature that uses part of an SSD's storage space to enhance the drive's performance -- and Rapid mode. Rapid mode is unique to Samsung SSDs and is the most interesting and appealing feature.

Rapid is an acronym, standing for Real-time Accelerated Processing of I/O Data. It basically means that it uses the available system memory (RAM) on the host computer as an input/output cache to boost the performance. Since most new computers come with a large amount of RAM, Rapid is a welcome feature.

Previously with the 840 Pro and 840 Evo, Rapid used up to 1GB of RAM for cache. Starting with the 850 Pro, Rapid now can use up to 4GB or 25 percent of the host computer's RAM, whichever is larger, as cache. More cache means better performance. In my testing, I found no reason why you shouldn't use Rapid mode.

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The Samsung 850 Pro offers a good set of features, including the Rapid mode, via the Samsung Magician software. Dong Ngo/CNET

Apart from the 2TB, which just came out and has the suggested price of $1,000, the US street prices of the other capacities are at $98, $152, $255, $489 for 128GB, 256GB, 512GB and 1TB respectively. Generally, the drive costs from 47 cents to 59 cents per gigabyte, among the most expensive on the market. The SSD 850 Evo for example, costs just around 33 cents per gigabyte. Note that when buying SSDs, the higher the capacity, the less cost per gigabyte. This means buying larger capacity drives will give always you more for your money.

It's important to note that while the the SSD 850 Pro is faster than the SSD 850 Evo for the most part, in real-world usage, you might not notice at all. The SSD 850 Pro's 10-year warranty, however, is clearly better than the five-year of its sibling.

Transcend SSD370S (512GB) Samsung SSD 850 Evo (500GB) Samsung SSD 850 Evo (250GB) Transcend SSD370S (256GB) Samsung SSD 850 Pro (1TB) Samsung SSD 850 Pro (2TB) SanDisk Extreme Pro (480GB) Samsung SSD 850 Pro (512GB) SanDisk Extreme Pro (240GB) Samsung SSD 850 Pro (256GB) Samsung SSD 850 Pro (128GB) Measured in cost per gigabyte based on current price on MSRP used for the 2TB capacity. The lower number indicates better value.

Top performance

The Samsung SSD 850 Pro did very well in testing. I tested the new drive with its 256GB, 512GB, 1TB and the new 2TB capacities and they basically offer the same performance. The drives were tested as a main storage device that host the operating system, since the Rapid mode doesn't work when the drive is used as a secondary drive. The test machine is a midrange computer running a Core i5 processor with 8GB of system memory.

In our sequential data transferring test, the new drive scored a sustained speed of 246MBps when doing both writing and reading at the same time, slightly slower than the 251MBps of the SanDisk Extreme Pro. When Rapid mode is turned on, however, the Samsung registered 287MBps, by far the fastest result.

Measured in megabytes per second.

Moving on to the tests with the PC Mark benchmark suite, the new Samsung drive was consistently excellent. The drive also scored the highest compared with other SSDs.

Higher number means better performance.

PC Mark also showed that the Samsung SSD 850 Pro helped improve the application performance slightly compared with the SanDisk Extreme Pro, especially in Rapid mode.

Measured in seconds. Shorter bars means better performance.

In all the Samsung 850 Pro is one of the fastest, if not the fastest SSD on the market. Note that you need to use it in a computer that supports SATA 3 (6Gbps) to be able to fully appreciate its performance.


If money is not an issue, you can't go wrong with the Samsung SSD 850 Pro. The drive has it it all: top performance, plenty of useful features, the highest storage capacity (up to 2TB) and a super long 10-year warranty.

But cost is always an issue and in real-world usage, chances are you won't notice the little extra performance the 850 Pro has over competing drives that are cheaper, such as its sibling SSD 850 Evo that costs some 20 percent less and offers neck-and-neck performance in many tests.

Generally SSDs are all so much faster than regular hard drives that the performance gaps between them are minimal to the user. So while the SSD 850 Pro is a great drive, worthy of the investment for professional users, it does not offer the most for your money.

At the end of the day, if the best deal is what you're after, the 850 Evo is the way to go, but if you want something top-notch without any compromises, the 850 Pro is the drive you want.

The Largest Consumer SSD Drives: Samsung 850 Pro and Evo 2TB SSD

Samsung HDD released the world’s thinnest 4TB portable drive, namely Samsung M3 4TB Portable Drive and Samsung P3 4TB Portable Drive. These two 2TB Samsung 850 Pro and Evo 2TB SSDs were released. It cannot be denied that Samsung is now the leader in advanced memory technology all over the world and also the most productive hard drive manufacturer.

In early days, SSDs were always small in capacity, generally 32GB or 64GB, and even today massive storage SSD is rare especially for ordinary consumers. But recently Samsung released the largest consumer solid-state drives, namely 850 Pro 2TB SSD and 850 Evo 2TB SSD, which is a big breakthrough in this area.

Tip: Here we just talk about consumer SSD but not enterprise SSD.

Samsung has announced three TCO-optimized and high-performance SSDs including PM1633, PM1725 and PM953 adding to its portfolio of advanced enterprise and data center SSDs, and the largest capacity can be 3.84TB, 6.4TB, and 1.92TB. Well then, how can Samsung produce such large-capacity solid state drives? It is due to the use of 3D V-NAND technology, which will be introduced in the following content.

Samsung 850 Pro and Evo 2TB SSD Specifications

For the detailed specifications of these two Samsung 850 Pro and Evo SSDs, you can refer to the following table.

From the above specs you know both the Pro and Evo are 2.5-inch solid state drives and employ SATA3 interface whose transfer rate reaches to 6Gbps. Well, how fast is 6Gbps? It is about 750MB/s, but in fact this is just a theoretical value, and the actual speed would be slower due to different kinds of restrictions.

In addition, they employ the same controller as well as offer the same cache. Of course, there are many different specifications apart from similarities, including sequential read/write speed, random read/write speed, endurance, price, and warranty. Next, let’s analyze some of these specifications in detail.

3D V-NAND Technology, Controller, and Cache in Samsung 850 Pro and Evo 2TB SSD

After taking apart the SSD, we can see eight chips which are required to reach the 2TB capacity (4 chips each side of the PCB). That is to say, capacity of every chip reaches to 256GB.

Why each chip is so large in capacity? It is owed to the use of 3-dimensional vertical flash memory technology, namely 3D V-NAND. Compared with traditional 2D planar setup which puts all memory cells horizontally, 3D V-NAND technology stacks cells vertically up to 32 layers, which makes it possible to add more memory cells in the same number of wafer bits, thus increasing capacity and lowering costs.

However, the 3D V-NAND technology used by 850 Pro is a little different from that used on the 850 Evo. To be specific, 850 Pro makes use of Samsung 3D V-NAND MLC while the Evo employs Samsung 3D V-NAND TLC.

MLC is short for Multi-Level Cell while the full name of TLC is Triple Level Cell. The former enjoys up to 10,000 program/erase cycles per cell while the latter just provides about 5,000 cycles. Compared with MLC, TLC has slower read and write speeds and lower endurance limit or shorter lifespan.

All these explain why Samsung 850 Pro 2TB SSD is more expensive than 850 Evo 2TB SSD. Now that the former is more expensive, naturally Samsung gives much longer warranty to it. In addition to the 3D V-NAND technology, there are 2 big changes in Samsung 850 Pro and Evo 2TB SSD: one is the new controller, and the other is the high-speed DRAM.

The controller used on Samsung 850 Pro and Evo 2TB SSD is different from those employed on other models of Samsung 850 SSDs. Here we take the Samsung 850 Pro for example. The 128GB, 256GB, 512GB, and 1TB 850 SSDs use Samsung MEX controller, while the 2TB SSD makes use of the new MHX controller.

The former controller has a triple-core Cortex R4 processor, which is just like the SSD 840 Pro’s MDX except that the frequency of its three cores has been increased from 300MHz to 400MHz. But for the new controller MHX, so far Samsung hasn’t given any more detailed information, and we just know it is based on ARM architecture and also has 3 cores. Well then, why Samsung gives up MEX but employs MHX on 2TB SSD drives? Samsung says it is introduced because the original MEX controller isn't designed for capacities above 1TB.

Apart from controller, Samsung 850 Pro and Evo 2TB SSD drives have made great improvement on cache support. Nowadays, NAND mapping table designs tend to require about 1MB of DRAM per 1GB of NAND for optimal performance, so a 2TB SSD requires DRAM controller capable of supporting 2GB of DRAM. Therefore, Samsung employs the 2 GB LPDDR3 for their 2TB solid state drive, which can quicken data access speed and boost SSD service time to a large extent.

After getting to know these improvements, let’s see how fast these 2 SSD drives are.

Read/write Speed Test on Samsung 850 Pro and Evo 2TB SSD

Firstly, we tested Samsung 850 Pro 2TB SSD on AS SSD Benchmark, which is a standard testing program specially designed for solid state drive. And our testing results are shown in 2 forms: one is in MB/s, and the other is in IOPS.

Tip: To test the performance of these two Samsung 2TB SSD, you can also use the Disk Benchmark feature of MiniTool Partition Wizard.

Free Download

From the test we know sequential read and write speeds of the 850 Pro are 520.68MB/s and 499.38MB/s respectively, which are slower than boasted (in the Specification part, we have said sequential read and write speeds of Samsung 850 Pro 2TB SSD are 550MB/s and 520MB/s). And the IOPS read/write speeds are also reduced. Generally, the speed reduction could be affected by hardware restrictions, quality of testing programs, or other factors.

However, though there is much reduction, these values are much higher than those of similar products. For example, its 4K-64 Thrd read speed reaches to 95997IOPS, and the write speed is 79197IOPS, which are rarely seen.

Then, we tested the 850 Evo 2TB SSD also on the AS SSD Benchmark, getting the following results:

Sequential read and write speeds of the 850 Evo 2TB SSD are 516.68MB/s and 497.36MB/s, which are just several MB slower than those of the 850 Pro. And there is also slight reduction in other speeds, like 4k speed and 4k-64Trd speed. To some extent, the 850 Evo 2TB SSD can be matched with the 850 Pro SSD in read-write speed.

Next, we tested both the Pro and Evo on CrystalDiskMark, which is an easy to use but professional disk testing app and provides users with all-sided testing items, including consequential read/write speed, 512K read/write performance, 4K data packet read/write speed, and random performance under 32 Queue Depth.

From the tests on CrystalDiskMark we know sequential read/write speeds of the 850 Pro reach to 549MB/s and 528.4MB/s, and 4K read speed is 46.83MB/s while write speed is 171.2MB/s. And the speeds of the 850 Evo are slightly slower than those of the 850 Pro. Though these are not ultimate speeds but quite rare in SATA3 products.

To summary, since Samsung 850 Evo 2TB SSD has nearly the same read-write speed (just several MB slower) as Samsung 850 Pro 2TB SSD, for me, I’d like to buy the Evo. After all, the Evo is $200 cheaper than the Pro. However, if you consider endurance and warranty, 850 Pro would be a good choice.

However, SSD read-write performance can be affected by lots of factors, among which 4K misalignment is the most serious one. If partitions on SSD are misaligned, read-write performance will be heavily reduced. And we even can say SSD with unaligned partitions functions just like a mechanical hard disk. For more details, please see Partition Align. Therefore, to align SSD partitions regularly is a necessity for all SSD users.

In Windows Vista and later released Windows OS, newly created partitions will be aligned automatically, but after doing operations like resize partition and move partition location, the originally aligned partition may be unaligned. In addition, if users clone partitions to SSD, these cloned partitions are always misaligned. Under these situations, users had better employ a third-party partitioning tool to align partitions since Windows built-in programs cannot do it without data loss (users have to recreate partition), and next we recommend a freeware.

MiniTool Partitioning Solutions to Samsung 850 Pro and Evo 2TB SSD

To manage the Samsung 850 Pro and Evo Pro SSD, the professional partition manager – MiniTool Partition Wizard is strongly recommended. It is designed to optimize the partition and disk use without data loss.

For example, it can help you to repair partition, check partition for errors, extend partition, fix MBR and so on.

So, if you want to upgrade your system to the larger HDD or SSD, such as the Samsung 850 Pro and Evo 2TB SSD, MiniTool Partition Wizard can help you, too.

Therefore, get MiniTool Partition Wizard free immediately.

Free Download

And we will show you how to clone hard drive to the Samsung SSD.

Step 1: Start Disk Cloning Proces

  1. Connect the Samsung 850 Pro SSD to your computer.
  2. Launch MiniTool Partition Wizard.
  3. Select the disk you want to clone and choose Copy from the context menu.

Step 2: Select the Target Disk

  1. Select the target disk.
  2. Click Next to continue.
  3. All data on the target disk will be destroyed and click Yes to continue. If there are important files, please back up them in advance.

Step 3: Select Copy Options

  1. Select a copy option.
  2. To improve the performance of SSD, the option Align partitions to 1MB should be checked.
  3. (Professional Edition only) To clone your system disk to the SSD with GPT partition style, check the Use GUID Partition Table for the target disk option.

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Step 4: Boot from the Target Disk

  1. In order to boot the computer from the target disk, please change the BIOS settings.
  2. Click Finish to continue.

Step 5: Start Disk Cloning Process

  1. Preview the changes.
  2. Click Apply to confirm the changes.

When all steps are finished, you also have finished the disk clone. In addition, the Migrate OS to SSD feature can also help you to clone the system disk to SSD. You can have a try. Of course, MiniTool Partition Wizard has many powerful features to help you manage Samsung 850 Pro and Evo 2TB SSD.

Free Download

Related article: 2 Reliable and Powerful MiniTool SSD Cloning Software (No Data Loss)

MiniTool Partition Wizard is a powerful disk cloning tool that can help me to clone hard drive to SSD without data loss within just a few steps.Click to tweet

In conclusion, this post has given you a complete introduction of the Samsung 850 Pro and Evo 2TB SSD and also has introduced the partition magic – MiniTool Partition Wizard to help you manage the SSD and HDD.

And if you have problem of MiniTool Partition Wizard, please feel free to contact us via the email [email protected].

Samsung 850 PRO SSD 2TB Review |

Today Samsung released a new addition to its 850 PRO SSD line, the SSD 850 PRO 2TB. This marks the largest capacity consumer SSD for Samsung and the first 2TB consumer SSD commercially available. Like the rest of the line, the new 850 PRO 2TB uses Samsung’s 32-layer 3D V-NAND 2bit MLC/3bit MLC. Samsung states that its 3D up to two times the density and write speed performance. The drive has 2GB of LPDDR2DRAM cache memory, SATA 6Gb/s interface, and comes with a 10-year warranty.

Samsung’s 850 PRO line is all about performance, and from our last review one can see that they can deliver on that performance. The latest drive also claims some pretty impressive numbers. On Sequential read speeds, Samsung claims the 2TB can hit 550MB/s and on sequential write it can hit 520MB/s. On 4K random tests the 850 PRO 2TB claims performance of 100,000 IOPS read (QD32) and 90,000 IOPS write (QD32). These are right about the same speeds that the lower capacity models claimed. The 2TB drive also has high reliability with 2 million hours MTBF and 300TBW. Samsung is aiming to take the performance of the 850 PRO line and bring it to the highest capacity drive that one can currently buy.

Like the other drives in the line, the 850 PRO 2TB comes with a 10-year warranty and a retail price of $999.99. 

Samsung 850 PRO SSD Specifications (2TB) 

  • Capacities: 128GB, 256GB, 512GB, 1TB, 2TB
  • Dimensions (LxWxH): 100 x 69.85 x 6.8 (mm)
  • Interface: SATA 6Gb/s (compatible with SATA 3Gb/s and SATA 1.5Gb/s)
  • Form Factor: 2.5 inch
  • Controller: Samsung MHX controller
  • NAND Flash Memory: Samsung 3D V-NAND 2bit MLC
  • DRAM Cache Memory: 2GB LPDDR3
  • Sequential Read: Max. 550 MB/s
  • Sequential Write: Max. 520 MB/s
  • Performance
    • 4KB Random Read (QD1): Max. 10,000 IOPS
    • 4KB Random Write (QD1): Max. 36,000 IOPS
    • 4KB Random Read (QD32): Max. 100,000 IOPS
    • 4KB Random Write (QD32): Max. 90,000 IOPS
  • TRIM Support   
  • Garbage Collection
  • S.M.A.R.T
  • AES 256-bit Full Disk Encryption (FDE)
  • TCG/Opal V2.0, Encrypted Drive (IEEE1667)
  • Weight: Max. 66g
  • Reliability            
    • MTBF: 2 million hours
    • 300 Terabytes Written (TBW)
  • Power Consumption
    • Active Read (Average): Max. 3.3W
    • Active Write (Average): Max 3.4W
    • Idle: Max. 60mW
    • Device Sleep: 5mW
  • Temperature Operating: 0°C to 70°C
  • Non-Operating: -40°C to 85°C
  • Humidity: 5% to 95%, non-condensing
  • Vibration: Non-Operating: 20~2000Hz, 20G
  • Shock: Non-Operating: 1500G , duration 0.5msec, 3 axis
  • Warranty: 10 years limited

Design and Build

The Samsung SSD 850 PRO 2TB model looks identical to its smaller capacities with its minimalistic, slim black/charcoal design comprised of a flat black top with Samsung branding and a simple “Solid State Drive” text. It is of 7mm z-Height form factor, allowing it support a variety of applications such as notebooks, desktops, and ultrabooks. 

When flipping the drive over shows a sticker with all the key information about the drive. The side profiles are equipped with four screw holes to allow seamless mounting of the 850 PRO.

When looking under the hood, you will see the highly vertically integrated components, including the Samsung DRAM, Samsung V-NAND and Samsung SSD controller.  The 2TB model uses the Samsung MHX controller (compared to the 1TB’s Samsung MEX) and supports a SATA 6Gb/s interface, though it is also compatible with SATA 3Gb/s and SATA 1.5Gb/s. Looking further inside the 2TB 850 PRO will show 8x 128GB 32-layer 3D NAND packages and 2GB of LPDDR3 memory.

Consumer Synthetic Benchmarks

All consumer SSD benchmarks are conducted with the StorageReview client testing platform. The comparables used for this review include:

  • Samsung 850 Pro 1TB (SATA, 6Gb/s, Samsung MEX controller)
  • Micron M600 1TB (SATA, 6Gb/s, Marvell 88SS9189-BLD2 controller)
  • SanDisk Extreme Pro 1TB (SATA, 6Gb/s, Marvell 9187 controller)
  • Crucial MX200 1TB (SATA, 6Gb/s, Marvell 88SS9189 controller)
  • Crucial MX200 500GB (SATA, 6Gb/s, Marvell 88SS9189 controller)
  • OCZ Vector 180 480GB (SATA, 6Gb/s, OCZ Barefoot 3 M00 controller)
  • OCZ Vector 180 960GB (SATA, 6Gb/s, OCZ Barefoot 3 M00 controller)

All IOMeter figures are represented as binary figures for MB/s speeds.

In our first test, which measures 2MB sequential performance, the 2TB Samsung PRO posted an impressive 495.77MB/s read and 472.40MB/s write, the latter which was the top performer. This also placed it in the upper middle of the pack for reads (though only by 3MB/s), with the 1TB PRO model at the top of our leaderboards.

Moving to our 2MB random transfer performance tests, the 850 PRO ranked at the top of our leaderboard in writes once again with 472.92MB/s, while reads hit 486.35MB/s, which was just behind the Crucial MX200 500GB.

In our IOMeter’s random 4K read and write test the SSD 850 PRO drive measured best-of-class reads with 39.89MB/s while writes it 116.35MB/s. The 1TB PRO capacity reached 37.19MB/s read and 117.16MB/s write.

Our random 4k test pushes hard on the drives when looking at throughput. In this scenario, the 850 PRO a very impressive 10,212.39 IOPS read and 29,784.99 IOPS write, taking the top spot among the leaders in the read column, handedly beating out the other top consumer drives. As for the 1TB PRO capacity also fared very well with 9,521.84 IOPS read and a leading 29,992.92 IOPS write.

Comparing write latency, the 850 PRO posted an average latency with just 0.0333ms (it should be noted that this was the exact same latency as its 2TB EVO brethren) while its maximum readings fell behind a bit with 10.073ms though well above the performance of the Vector drives.

In our next 4K test, we move to a workload with 100% write activity, which scales from 1QD to 64QD.  In the aligned write setting, the 2TB 850 PRO posted the best results of all the consumer drives with 30,027.63 IOPS in burst and 84,805.09 IOPS in the terminal. The 1TB model was hot on its trail with a range of 30081.91 IOPS to 84,178.54 IOPS

Moving on to our aligned read reading benchmark, the 2TB PRO recorded a QD1 IOPS of 10,367.53, though reaching only 90,956.16 IOPS in the terminal, which was noticeably less than that of its 1TB brother.

Our final consumer synthetic benchmarks compare the drives in a series of mixed server workloads with a queue depth from 1 to 128. Each server profile has a strong bias towards read activity, ranging from 67% read with the database profile to 100% read in the web server profile.

The database profile features a 67% read and 33% write workload focusing on transfers around 8K in size. Here, the 2TB PRO posted results just behind its 1TB brethren in the terminal with 49,435.73 IOPS; however, it posted an impressive, and class leading, burst speed of 11,007.53 IOPS.

Our next benchmark is the web server profile is read-only with transfer sizes ranging from 512B to 512KB. In this scenario, the 2TB PRO posted best-of-class performance throughout the entirety of the test, with a range of 7,612.45 IOPS to 30,624.37 IOPS.

The file server profile has 80% read and 20% write workload spread out over multiple transfer sizes ranging from 512-byte to 64KB. Again, the 2TB PRO showed class-leading results, with an impressive 8,796.66 IOPS in burst speeds and 36,697.92 IOPS at QD64, easily taking top spot among the other consumer drives.

The last profile looks at workstation activity, with a 20% write and 80% read mixture using 8K transfers. Here, the 2TB Samsung 850 PRO recorded another leading burst speed of 10,241.17 IOPS while the terminal ended with a whopping 52,511.70 IOPS.

Consumer Real-World Benchmarks

While the results of synthetic benchmarks are important to identify the key strengths and weaknesses of a drive, performance in these tests does not always translate directly into real-world situations. To get a better idea how the 2TB Samsung SSD 850 PRO will handle itself in the field we will chart StorageMark 2010 HTPC, Productivity, and Gaming traces against comparable drives. Higher IOPS and MB/s rates with lower latency times are preferred.

The first traced is based on use as a Home Theater PC (HTPC). The test includes playing one 720P HD movie in Media Player Classic, one 480P SD movie playing in VLC, three movies downloading simultaneously through iTunes, and one 1080i HDTV stream being recorded through Windows Media Center over a 15 minute period.

In our HTPC profile, the 2TB 850 PRO SSD posted 7,561.15 IOPS, 350.55MB/s and 0.947ms in average latency. The top overall performer here was the SanDisk Extreme Pro.

The next trace simulates disk activity in an office workstation or productivity scenario. This test includes three hours of operation in an office productivity environment with 32-bit Windows Vista running Outlook 2007 connected to an Exchange server, web browsing using Chrome and IE8, editing files within Office 2007, viewing PDFs in Adobe Reader, an hour of local music playback, and two hours of streaming music via Pandora.

In our Productivity trace, the 2TB Samsung 850 PRO SSD really picked up in performance, posting top, best-in-class results in every category: 13,074.89 IOPS, 381.67 MB/s, and 0.603ms in average latency.

The final consumer real-life benchmark simulates disk activity during gaming. This simulation taxes the drive’s read performance, with 6% write operations and 94% read operations. The test consists of a Windows 7 Ultimate 64-bit system pre-configured with Steam, with Grand Theft Auto 4, Left 4 Dead 2, and Mass Effect 2 already downloaded and installed. The trace captures the heavy read activity of each game loading from the start, as well as textures as the game progresses.

In this gaming profile, the 2TB PRO boasted impressive results once again, though it fell just shy of top spot behind its 1TB brethren.


The Samsung 850 PRO is a 2.5” SSD powered by 3D virtual NAND technology. The latest entry in the line is a 2TB model, which not only is the highest capacity drive in the 850 PRO line, it is also currently the highest capacity for the entire SSD market. The previous 850 PROs we tested have remained as the top performers we’ve seen in a 2.5” form factor. Samsung is looking to take this performance and bring it into higher capacity (in this case doubling the previous maximum capacity). The drive has a SATA interface and comes with a 10-year warranty.

Looking at performance in more detail, the 2TB Samsung 850 PRO posted both best-in-class, bar-setting numbers, particularly during our synthetic tests; however, it was sometimes outshone by its smaller 1TB capacity brother. In our 2MB performance benchmark, the 2TB model posted an impressive 495.77MB/s read and 472.40MB/s write, the latter which was the top performer, while random write performance hit another class leading 472.92MB/s. Reads were also right at the top of the leaderboard  with 486.35MB/s, which was just behind the Crucial MX200 500GB SSD. In our IOMeter’s random 4K test, the SSD 850 PRO drive measured best-of-class read activity with 39.89MB/s while the throughput benchmark boasted results placing it at the top spot on the leaderboard once again. Though the 850 PRO posted the best results of all the consumer drives with 30,027.63 IOPS in burst and 84,805.09 IOPS in the terminal, in our 100% aligned write test, the 1TB model handedly beat out the 2TB model in aligned write. During our series of mixed server workloads, the 2TB 850 PRO recorded class-leading results in all profiles, with the exception of our database profile, which had a throughput in the terminal just behind its 1TB brother. In our last set of tests (consumer real-world), the 2TB 850 PRO drive continued its great performance, showing bar-setting numbers during our productivity trace with 13,074.89 IOPS, 381.67 MB/s, and 0.603ms in average latency.

With all of this considered, Samsung has released yet another best-of-class SSD on the market. The 2TB 850 PRO model has certainly followed the footsteps of its smaller capacity brethren, offering even better performance in many of our tested categories. Though very expensive, professionals and power-users should look no further when it comes to this drive if price is not an issue.


  • Highest capacity SSD currently available
  • Set a new bar in performance in many of our benchmarks
  • Samsung pedigree with a 10-year warranty


  • Much more expensive than a 2TB HDD

Bottom Line

The Samsung 850 PRO 2TB drive is a bar-setting SSD in both capacity and performance, offering power users arguably the best consumer drive on the market.

Samsung SSDs at Amazon

Discuss this review

Samsung 850 Pro 2TB Review


  • Huge, hard disk-style capacity
  • Excellent performance levels
  • Lengthy warranty and endurance


  • No quicker than 850 Evo 2TB
  • Pricier than 850 Evo 2TB
  • No extras included

Key Specifications

  • Review Price: £731.00
  • 2TB capacity
  • 1,863GB formatted capacity
  • 7mm form factor
  • SATA 3 interface
  • 10yr RTB warranty
  • Manufacturer: Samsung

Samsung’s 850 Pro represents the pinnacle of the performance SSD market, but its position at the top of the heap is under threat: cheaper drives are offering decent performance for less cash, and new form factors such as PCI Express and M.2 are pushing the performance envelope.

One response is to increase capacities. This version of the 850 Pro features 2TB, which results in 1,863GB of formatted space. That makes it one of the largest SSDs we’ve ever seen.

SEE ALSO: Our Verdict on the Best M.2 SSDs

Samsung 850 Pro 2TB – Under the Hood

The 850 Pro is Samsung’s top-tier consumer drive, and is packed with the firm’s best technology.

Star of the show is 3D V-NAND, which was introduced with more conventional 850 Pro capacities at the start of the year. It’s a sea change for how the memory inside SSDs is ordered: instead of packing transistors horizontally, these tiny components are now stacked vertically. This results in more space for transistors, meaning Samsung doesn’t have to produce smaller transistors.

The 850 Pro uses a 40nm manufacturing process. On paper, that’s archaic compared to the sub-20nm processes used elsewhere, but it affords the 850 Pro much better performance and reliability than many other drives.

Opting for MLC, or multi-level cell, memory chips is also a decision taken with performance in mind. Here, each silicon cell can store two bits of data at once. It’s more expensive than the triple-level cell chips used in cheaper drives, but it means that more of the 850 Pro’s resources can be devoted towards getting those two bits of data in and out as quickly as possible.

The one component that has been swapped out is the controller – but, even then, it’s only a slight tweak. The new MHX chip still has the ARM-powered cores of its predecessor, but it’s been given more memory in order to cope with the increased demands of the Pro’s 2TB capacity.

The 850 Pro shares much with the cheaper 850 Evo, but it justifies its higher price with a more generous endurance rating. Its 300TB quoted lifespan is one of the best in the entire consumer SSD market, and it’s twice as long as the 850 Evo’s rating.

SEE ALSO: The Latest Component Reviews

Samsung 850 Pro 2TB – Performance

Samsung’s 850 Pro is designed for speed, but there’s very little between this drive and the 850 Evo in many of our benchmarks.

The 850 Pro’s AS SSD sequential read and write results of 517MB/sec and 505MB/sec are among the best we’ve seen from a SATA drive, but only the former is better than the Evo. When working with smaller files it could only match the Evo when reading, and fell behind slightly in the file-write tests. When the difference is only a few megabytes per second, however, you’re unlikely to notice.

Similar patterns emerged in CrystalDiskMark. The 850 Pro’s sequential read and write speeds of 546MB/sec and 527MB/sec match the Evo, it fell behind when reading files, and sped up when writing. The 850 Pro’s 512Kb read pace of 502MB/sec is 4MB behind the Evo, but its write speed of 520MB/sec was 2MB quicker.

There was little to choose between the two drives in the Atto test. The 850 Pro quickly ascended to speeds beyond 500MB/sec, and its reads and writes topped out at 561MB/sec and 538MB/sec respectively. Those results are only a megabyte or two ahead of the Evo,, but they’re among the best we’ve seen from SATA SSDs.

The 850 Pro’s only performance issue really comes in Iometer, where it returned an overall score of 5,673 I/Os per second. That’s a great result, but it’s still a few hundred points behind the 850 Evo.

The 850 Pro doesn’t deviate much from smaller capacities in benchmarks, but the hardware is limited by the 600MB/sec limit of its SATA connection. To go beyond that you’ll have to opt for an M.2 or PCI-based product, but then you’ll be exchanging capacity for speed. If it’s a drive like the PCI-based Intel SSD 750, you may end up paying an even higher price.

Other Things to Consider

The 850 Pro doesn’t stray from the Evo drive in terms of performance – instead, Samsung justifies its higher price in other areas. We’ve already mentioned the Pro’s stellar 300TB endurance rating, and the drive is protected by a ten-year warranty. That’s one of the best deals in the consumer space – and twice what’s included with the 2TB Evo.

In terms of extras, though, that’s it. No screws for PC installation or a 9.5mm blanker is included in the box, so you’ll need to add the cost of such accessories to your bill.

Should I Buy the Samsung 850 Pro 2TB?

The 850 Pro is designed to be Samsung’s flagship SSD. In performance terms, however, there’s very little between the Pro and the cheaper 850 Evo – no surprise, given they use the same controller and their 3D V-NAND designs.

Instead of streaking ahead in benchmarks the 850 Pro adds value elsewhere, with a high endurance rating and generous warranty. They’re great, but they also mean the 850 Pro becomes even more of a niche product – only a few of the handful of consumers who want to buy a 2TB SSD will be interested in one with such extreme protection levels, especially given the extra cost.

If that’s you, then the 850 Pro is the best high-capacity SSD on the market. If you need its space and speed, but for less money, then 850 Evo is a fine alternative.

Check out our verdicts on Samsung’s latest mSATA and M.2 SSDs, or investigate this round-up of more conventional consumer SSDs.


The Samsung 850 Pro combines impressive performance levels with the market’s best endurance rating and warranty. But if you don’t require that level of protection, then the 2TB 850 Evo offers equivalent performance for less.

Score in detail

Mike has worked as a technology journalist for more than a decade, writing for most of the UK’s most well-known websites and magazines. During his time writing about technology he’s developed obsessio…

Unlike other sites, we thoroughly test every product we review. We use industry standard tests in order to compare features properly. We’ll always tell you what we find. We never, ever accept money to review a product. Tell us what you think - send your emails to the Editor.

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