Controller: Marvell 88SS9187-BLD2. Flash Memory: SanDisk 19nm eX2 ABL MLC.

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

Real World Speed
Performance profile from 6,604 user samples
429 User Benchmarks
Best Bench: 103% 76GB free
Worst Bench: 61% 169GB free
Worst: 61% Best: 103%
SPEED RANK: 117th / 796
6,175 User Benchmarks
Best Bench: 105% 179GB free
Worst Bench: 52% 140GB free
Worst: 52% Best: 105%
SPEED RANK: 138th / 796
Effective Speed
Effective SSD Speed
83.1 % +2% 81.6 % -2%
Avg. Sequential Read Speed
448 MB/s -7% 480 MB/s Slightly faster read speed.
Avg. Sequential Write Speed
392 MB/s Slightly faster write speed.
349 MB/s -12%
4K Read
Avg. 4K Random Read Speed
27.6 MB/s -1% 27.8 MB/s +1%
4K Write
Avg. 4K Random Write Speed
79.4 MB/s Slightly faster random write.
75.5 MB/s -5%
Avg. Sequential Mixed IO Speed
377 MB/s -1% 379 MB/s +1%
4K Mixed
Avg. 4K Random Mixed IO Speed
20.6 MB/s -5% 21.7 MB/s Slightly faster random mixed IO.
Peak Sequential Read Speed
488 MB/s -7% 524 MB/s Slightly faster peak read speed.
Peak Sequential Write Speed
482 MB/s -2% 491 MB/s +2%
4K Read
Peak 4K Random Read Speed
35.7 MB/s -2% 36.4 MB/s +2%
4K Write
Peak 4K Random Write Speed
126 MB/s Slightly faster peak random write.
117 MB/s -8%
Peak Sequential Mixed IO Speed
455 MB/s -12% 508 MB/s Slightly faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
29 MB/s +0% 28.9 MB/s -0%
Market Share
Based on 1,143,571 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.1 % -800% 0.9 % Hugely higher market share.
Value For Money
74.6 % Much better value.
46.1 % -62%
User Rating
UBM User Rating
59 % -5% 62 % Slightly more popular.
Price (score)
$105 Much cheaper.
$208 -49%
39 Months More recent.
46 Months -15%
DQ Read
Peak 4K-64Thread Read Speed
363 MB/s -2% 372 MB/s +2%
DQ Write
Peak 4K-64Thread Write Speed
303 MB/s -4% 316 MB/s +4%
AS-SSD Total
AS-SSD Total Score
1166 Pts -2% 1,190 Pts +2%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
67.3 MB/s -35% 90.9 MB/s Much faster peak deep queue mixed IO.
ADQ Read
Avg. 4K-64Thread Read Speed
195 MB/s -1% 197 MB/s +1%
ADQ Write
Avg. 4K-64Thread Write Speed
199 MB/s Slightly faster deep queue write.
186 MB/s -7%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
42.7 MB/s -29% 55.2 MB/s Faster deep queue mixed IO.
240GB 256GB

The Sandisk Extreme II uses the 88SS9187-BLD2 controller, Marvel's latest, and Sandisk's own 19MM MLC Memory. On paper this makes an extremely good combination and the benchmarks agree. The Extreme II scored an impressive 1143 in the server orientated AS SSD Benchmark putting it amongst the more capable server drives. In terms of real world consumer performance the Extreme II also fared well achieving a real world speed index score of 570.5 MB/s, amongst the top three scores we have seen to date. The Extreme II has everything going for it apart from its price which is currently significantly above average and hurting its value rating. Because the Extreme is the newest SSD we have in our group test we expect prices will drop with time. Until then, however, there is better value to be had elsewhere. [Jun '13 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) August 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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