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


Controller: Phison PS3110-S10. NAND Flash: Toshiba 19nm MLC.

Real World Speed
Performance profile from 17,166 user samples
16,608 User Benchmarks
Best Bench: 107% 24GB free
Worst Bench: 55% 132GB free
Poor: 55% Great: 107%
SPEED RANK: 138th / 859
558 User Benchmarks
Best Bench: 102% 148GB free
Worst Bench: 55% 41GB free
Poor: 55% Great: 102%
SPEED RANK: 144th / 859
Effective Speed
Effective SSD Speed
83.6 % +0% 83.3 % -0%
Avg. Sequential Read Speed
488 MB/s -1% 495 MB/s +1%
Avg. Sequential Write Speed
359 MB/s -18% 424 MB/s Faster write speed.
4K Read
Avg. 4K Random Read Speed
28.8 MB/s -1% 29.1 MB/s +1%
4K Write
Avg. 4K Random Write Speed
78.5 MB/s +4% 75.2 MB/s -4%
Avg. Sequential Mixed IO Speed
390 MB/s -16% 452 MB/s Faster mixed IO speed.
4K Mixed
Avg. 4K Random Mixed IO Speed
22.1 MB/s Much faster random mixed IO.
13.7 MB/s -61%
Peak Sequential Read Speed
524 MB/s -1% 528 MB/s +1%
Peak Sequential Write Speed
493 MB/s -3% 508 MB/s +3%
4K Read
Peak 4K Random Read Speed
36.4 MB/s -3% 37.6 MB/s +3%
4K Write
Peak 4K Random Write Speed
117 MB/s 0% 117 MB/s 0%
Peak Sequential Mixed IO Speed
509 MB/s -1% 515 MB/s +1%
4K Mixed
Peak 4K Random Mixed IO Speed
28.6 MB/s Much faster peak random mixed IO.
16.2 MB/s -77%
Market Share
Based on 3,841,929 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.74 % Insanely higher market share.
0.02 % -3,600%
Value For Money
44.1 % -18% 52.1 % Better value.
User Rating
UBM User Rating
64 % +3% 62 % -3%
Price (score)
$228 -25% $170 Cheaper.
59 Months -44% 33 Months Much more recent.
DQ Read
Peak 4K-64Thread Read Speed
373 MB/s +2% 364 MB/s -2%
DQ Write
Peak 4K-64Thread Write Speed
319 MB/s -9% 348 MB/s Slightly faster peak deep queue write.
AS-SSD Total
AS-SSD Total Score
1,195 Pts -2% 1,215 Pts +2%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
89.8 MB/s Much faster peak deep queue mixed IO.
62.6 MB/s -43%
ADQ Read
Avg. 4K-64Thread Read Speed
199 MB/s Slightly faster deep queue read.
175 MB/s -14%
ADQ Write
Avg. 4K-64Thread Write Speed
188 MB/s -12% 211 MB/s Slightly faster deep queue write.
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
53.9 MB/s Hugely faster deep queue mixed IO.
21.2 MB/s -154%
256GB 240GB

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) September 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 $297Nvidia GTX 1070 $410Samsung 850 Evo 250GB $86
AMD Ryzen 7 1700 $270AMD RX 480 $350Samsung 850 Pro 256GB $120
Intel Core i5-7600K $220Nvidia GTX 1060-6GB $265Samsung 850 Evo 500GB $149
Seagate Barracuda 1TB (2016) $45G.SKILL Trident Z DDR4 3200 C14 4x16GB $724SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $77Corsair Vengeance LPX DDR4 3000 C15 2x8GB $152SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $40HyperX Fury DDR4 2133 C14 2x8GB $141SanDisk Extreme 16GB $20
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