Controller: Samsung Dual Core MGX. Memory: Samsung 40nm TLC V-NAND

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

Real World Speed
Performance profile from 122,719 user samples
110,827 User Benchmarks
Best Bench: 117% 117GB free
Worst Bench: 68% 105GB free
Poor: 68% Great: 117%
SPEED RANK: 57th / 848
11,892 User Benchmarks
Best Bench: 107% 41GB free
Worst Bench: 54% 110GB free
Poor: 54% Great: 107%
SPEED RANK: 139th / 848
Effective Speed
Effective SSD Speed
94.6 % Slightly faster effective speed.
83.4 % -13%
Avg. Sequential Read Speed
498 MB/s +1% 492 MB/s -1%
Avg. Sequential Write Speed
391 MB/s Slightly faster write speed.
357 MB/s -10%
4K Read
Avg. 4K Random Read Speed
38.3 MB/s Much faster random read.
28.9 MB/s -33%
4K Write
Avg. 4K Random Write Speed
77.9 MB/s +0% 77.8 MB/s -0%
Avg. Sequential Mixed IO Speed
395 MB/s +2% 389 MB/s -2%
4K Mixed
Avg. 4K Random Mixed IO Speed
32.6 MB/s Much faster random mixed IO.
21.9 MB/s -49%
Peak Sequential Read Speed
517 MB/s -1% 523 MB/s +1%
Peak Sequential Write Speed
417 MB/s -17% 486 MB/s Faster peak write speed.
4K Read
Peak 4K Random Read Speed
47.8 MB/s Much faster peak random read.
36.5 MB/s -31%
4K Write
Peak 4K Random Write Speed
110 MB/s -5% 116 MB/s Slightly faster peak random write.
Peak Sequential Mixed IO Speed
422 MB/s -20% 508 MB/s Faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
48.3 MB/s Much faster peak random mixed IO.
28.6 MB/s -69%
Market Share
Based on 2,637,054 SSDs tested.
Market Share
Market Share (trailing 30 days)
8.5 % Hugely higher market share.
0.8 % -962%
Value For Money
90.9 % Hugely better value.
44.5 % -104%
User Rating
UBM User Rating
108 % Much more popular.
64 % -69%
Price (score)
$100 Much cheaper.
$224 -55%
28 Months Much more recent.
54 Months -48%
DQ Read
Peak 4K-64Thread Read Speed
378 MB/s +1% 376 MB/s -1%
DQ Write
Peak 4K-64Thread Write Speed
285 MB/s -13% 321 MB/s Slightly faster peak deep queue write.
AS-SSD Total
AS-SSD Total Score
1,172 Pts -2% 1,199 Pts +2%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
118 MB/s Much faster peak deep queue mixed IO.
88.8 MB/s -33%
ADQ Read
Avg. 4K-64Thread Read Speed
187 MB/s -2% 190 MB/s +2%
ADQ Write
Avg. 4K-64Thread Write Speed
186 MB/s -2% 190 MB/s +2%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
65.3 MB/s Faster deep queue mixed IO.
51.2 MB/s -28%
250GB 256GB

The 250GB Samsung 850 Evo has a similar architecture to its hugely successful predecessor, the 840 Evo. Both drives are TLC based but the 850 uses 3D V-NAND as opposed to regular NAND. Both drives also feature a Turbowrite cache (TWC) which buffers up to 3GB of writes. The TWC enables high burst write speeds but when the cache exhausts write speeds drop to 300 MB/s. Comparing the 850 and 840 Evos shows that effective speed, has improved by 11% and the warranty has been extended from three to five years but prices are also up by 11%. The 850 Evo does put in superb benchmarks (second only to the 850 Pro) but these are only valid within the TWC. At current price levels the 850 Evo struggles to compete with the value leaders[Dec '14 SSDrivePro]


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]


Solid State Drive Rankings (Price vs Performance) April 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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The Best.
Intel Core i7-7700K $300Nvidia GTX 1070 $330Samsung 850 Evo 250GB $100
Intel Core i5-7600K $229AMD RX 480 $238Samsung 850 Pro 256GB $146
Intel Pentium G4560 $60Nvidia GTX 1060-6GB $219Samsung 850 Evo 500GB $179
Seagate Barracuda 1TB (2016) $50Corsair Vengeance LPX DDR4 3000 C15 2x8GB $127SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $90G.SKILL Trident Z DDR4 3200 C14 4x16GB $700SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $46HyperX Fury DDR4 2133 C14 2x8GB $114SanDisk Ultra Fit 32GB $13
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