Controller: Samsung 3-core MDX. Flash Memory: Samsung 21nm Toggle Mode MLC.

Controller: Samsung 3 Core MEX. Memory: Samsung 19nm Toggle Mode TLC.

Real World Speed
Performance profile from 24,939 user samples
6,637 User Benchmarks
Best Bench: 107% 179GB free
Worst Bench: 52% 9GB free
Worst: 52% Best: 107%
SPEED RANK: 122nd / 798
18,302 User Benchmarks
Best Bench: 96% 27GB free
Worst Bench: 54% 19GB free
Worst: 54% Best: 96%
SPEED RANK: 175th / 798
Effective Speed
Effective SSD Speed
82.5 % +5% 78.7 % -5%
Avg. Sequential Read Speed
485 MB/s +1% 480 MB/s -1%
Avg. Sequential Write Speed
345 MB/s Slightly faster write speed.
314 MB/s -10%
4K Read
Avg. 4K Random Read Speed
28.7 MB/s -26% 36.3 MB/s Faster random read.
4K Write
Avg. 4K Random Write Speed
77.5 MB/s Much faster random write.
57.6 MB/s -35%
Avg. Sequential Mixed IO Speed
377 MB/s Faster mixed IO speed.
322 MB/s -17%
4K Mixed
Avg. 4K Random Mixed IO Speed
21.8 MB/s Slightly faster random mixed IO.
20.3 MB/s -7%
Peak Sequential Read Speed
522 MB/s +2% 510 MB/s -2%
Peak Sequential Write Speed
493 MB/s Much faster peak write speed.
351 MB/s -40%
4K Read
Peak 4K Random Read Speed
36.3 MB/s -25% 45.3 MB/s Faster peak random read.
4K Write
Peak 4K Random Write Speed
115 MB/s Much faster peak random write.
82.7 MB/s -39%
Peak Sequential Mixed IO Speed
508 MB/s Much faster peak mixed IO speed.
356 MB/s -43%
4K Mixed
Peak 4K Random Mixed IO Speed
28.3 MB/s +3% 27.4 MB/s -3%
Market Share
Based on 1,283,582 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.9 % -244% 3.1 % Hugely higher market share.
Value For Money
44.1 % -28% 56.4 % Better value.
User Rating
UBM User Rating
61 % More popular.
53 % -15%
Price (score)
$224 -34% $148 Much cheaper.
48 Months -19% 39 Months More recent.
DQ Read
Peak 4K-64Thread Read Speed
374 MB/s +2% 368 MB/s -2%
DQ Write
Peak 4K-64Thread Write Speed
316 MB/s Much faster peak deep queue write.
240 MB/s -32%
AS-SSD Total
AS-SSD Total Score
1,191 Pts Slightly stronger server IO.
1,069 Pts -11%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
90.1 MB/s Slightly faster peak deep queue mixed IO.
84.2 MB/s -7%
ADQ Read
Avg. 4K-64Thread Read Speed
207 MB/s Slightly faster deep queue read.
195 MB/s -6%
ADQ Write
Avg. 4K-64Thread Write Speed
190 MB/s Faster deep queue write.
149 MB/s -28%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
55.1 MB/s Slightly faster deep queue mixed IO.
48.1 MB/s -15%
256GB 250GB

The 840 Pro is stunning. Samsung have created a completely in-house package including both the controller and their own new 21nm toggle mode NAND. On release (Oct '12) this was the fastest performing deep queue depth consumer grade SSD available. Fast forward six months (Apr '13) and the 840 Pro still holds both the random read/write deep queue depth speed records of 384 MB/s and 326 MB/s, impressive considering how fast the SSD space tends to move. There are no obvious weaknesses, in-fact the 840 pro takes first place in nearly all of the speed categories and is only seriously rivalled by one drive, the OCZ Vector. To conclude, in terms of both outright performance, particularly server orientated, and value for money the 256GB and 128GB 840 Pros are amongst the top handful of drives currently available. [Jun '13 SSDrivePro]


The Evo is remarkable in that, like the Sandisk Extreme II, it features a second level cache. For the 250 GB Evo this consists of a 3 GB Turbowrite cache (TWC) which is a block of high speed Flash Memory. When the TWC is exhausted write speeds drop by approximately 50% but that won't often happen under typical consumer workloads. In terms of raw performance, even with its cache, the Evo still isn't the fastest drive. With a real world speed index reading of 439 MB/s the EVO is however, within reach of the two speed leaders (Vector and 850 Pro). At a price point of $130 the Evo is around 30% cheaper making it the best value for money SSDs I have seen in 2014. Comparing the Evo and the Sandisk Ultra Plus shows that the Evo is the winner but the Sandisk may be a viable alternative thanks to its cache-free, and therefore more consistent performance during extended writes. [Aug '14 SSDrivePro]


Solid State Drive Rankings (Price vs Performance) October 2016 SSD Rankings.

Welcome to our consumer SSD comparison. We calculate effective speed based on real world performance then adjust by cost per GB to yield a value for money rating. Calculated values don't always tell the whole picture so we check them against thousands of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top SSDs. Share your opinion by voting. [SSDrivePro]

How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: DX9 and DX10 3D performance.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.

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Intel Core i7-6700K $308Nvidia GTX 970 $260Samsung 850 Evo 250GB $104
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WD Black 1TB (2013) $69Corsair Vengeance LPX DDR4 3000 C15 2x8GB $85SanDisk Extreme 64GB $32
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WD Blue 1TB (2012) $50G.SKILL Trident Z DDR4 3200 C16 2x8GB $85SanDisk Extreme 16GB $16
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