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 46,419 user samples
13,391 User Benchmarks
Best Bench: 107% 218GB free
Worst Bench: 55% 1GB free
Poor: 55% Great: 107%
SPEED RANK: 133rd / 850
33,028 User Benchmarks
Best Bench: 96% 233GB free
Worst Bench: 59% 150GB free
Poor: 59% Great: 96%
SPEED RANK: 190th / 850
Effective Speed
Effective SSD Speed
83.8 % +5% 80.1 % -5%
Avg. Sequential Read Speed
490 MB/s +1% 486 MB/s -1%
Avg. Sequential Write Speed
355 MB/s Slightly faster write speed.
319 MB/s -11%
4K Read
Avg. 4K Random Read Speed
29 MB/s -28% 37.2 MB/s Faster random read.
4K Write
Avg. 4K Random Write Speed
78.8 MB/s Much faster random write.
60 MB/s -31%
Avg. Sequential Mixed IO Speed
387 MB/s Faster mixed IO speed.
331 MB/s -17%
4K Mixed
Avg. 4K Random Mixed IO Speed
22.4 MB/s Slightly faster random mixed IO.
21.1 MB/s -6%
Peak Sequential Read Speed
524 MB/s +3% 510 MB/s -3%
Peak Sequential Write Speed
497 MB/s Much faster peak write speed.
352 MB/s -41%
4K Read
Peak 4K Random Read Speed
36.6 MB/s -26% 46.2 MB/s Faster peak random read.
4K Write
Peak 4K Random Write Speed
119 MB/s Much faster peak random write.
85.6 MB/s -39%
Peak Sequential Mixed IO Speed
509 MB/s Much faster peak mixed IO speed.
357 MB/s -43%
4K Mixed
Peak 4K Random Mixed IO Speed
29.3 MB/s Slightly faster peak random mixed IO.
27 MB/s -9%
Market Share
Based on 2,833,001 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.86 % -141% 2.07 % Hugely higher market share.
Value For Money
44.7 % -28% 57.1 % Better value.
User Rating
UBM User Rating
64 % 0% 64 % 0%
Price (score)
$224 -33% $149 Much cheaper.
55 Months -16% 46 Months More recent.
DQ Read
Peak 4K-64Thread Read Speed
377 MB/s +3% 367 MB/s -3%
DQ Write
Peak 4K-64Thread Write Speed
322 MB/s Much faster peak deep queue write.
239 MB/s -35%
AS-SSD Total
AS-SSD Total Score
1,207 Pts Slightly stronger server IO.
1,071 Pts -13%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
91.2 MB/s Slightly faster peak deep queue mixed IO.
84 MB/s -9%
ADQ Read
Avg. 4K-64Thread Read Speed
200 MB/s Slightly faster deep queue read.
181 MB/s -10%
ADQ Write
Avg. 4K-64Thread Write Speed
190 MB/s Faster deep queue write.
152 MB/s -25%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
54.7 MB/s Slightly faster deep queue mixed IO.
47.7 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) May 2017 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: six 3D game simulations.
  • - 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.

 Frequently Asked Questions

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Intel Core i7-7700K $309Nvidia GTX 1070 $368Samsung 850 Evo 250GB $102
Intel Core i5-7600K $240AMD RX 480 $210Samsung 850 Pro 256GB $127
AMD Ryzen 7 1700 $300Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $167
Seagate Barracuda 1TB (2016) $50Corsair Vengeance LPX DDR4 3000 C15 2x8GB $127SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $700SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $46Corsair Vengeance LPX DDR4 3200 C16 2x8GB $136SanDisk Ultra Fit 32GB $13
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