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 664 user samples
71 User Benchmarks:
Best Score: 133% 203GB free
Worst Score: 75% 141GB free
Worst: 75% Best: 133%
SPEED RANK: 29th / 518
593 User Benchmarks:
Best Score: 139% 125GB free
Worst Score: 49% 3GB free
Worst: 49% Best: 139%
SPEED RANK: 34th / 518
Avg. Sequential Read Speed
451 MB/s -10% 495 MB/s Slightly faster read speed.
Avg. Sequential Write Speed
427 MB/s Slightly faster write speed.
401 MB/s -6%
4K Read?
Avg. 4K Random Read Speed
27.2 MB/s -5% 28.6 MB/s Slightly faster random read.
4K Write?
Avg. 4K Random Write Speed
73.9 MB/s +2% 72.1 MB/s -2%
Avg. Sequential Mixed IO Speed
393 MB/s -6% 418 MB/s Slightly faster mixed IO speed.
4K Mixed
Avg. 4K Random Mixed IO Speed
21.6 MB/s -1% 21.8 MB/s +1%
Peak Sequential Read Speed
486 MB/s -8% 525 MB/s Slightly faster peak read speed.
Peak Sequential Write Speed
488 MB/s -2% 497 MB/s +2%
4K Read?
Peak 4K Random Read Speed
35.8 MB/s -2% 36.4 MB/s +2%
4K Write?
Peak 4K Random Write Speed
128 MB/s Slightly faster peak random write.
119 MB/s -8%
Peak Sequential Mixed IO Speed
455 MB/s -12% 509 MB/s Slightly faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
29 MB/s +1% 28.7 MB/s -1%
Value For Money
85.3 % -12% 95.7 % Slightly better value.
User Rating?
UBM User Rating
71 % -11% 79 % Slightly more popular.
Price (score)
$162 -6% $152 Slightly cheaper.
Effective Speed?
Effective SSD Speed
476 MB/s -2% 485 MB/s +2%
17 Months More recent.
24 Months -29%
DQ Read?
Peak 4K-64Thread Read Speed
368 MB/s -3% 379 MB/s +3%
DQ Write?
Peak 4K-64Thread Write Speed
306 MB/s -4% 317 MB/s +4%
AS-SSD Total?
AS-SSD Total Score
1,179 Pts -2% 1,204 Pts +2%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
67.5 MB/s -34% 90.3 MB/s Much faster peak deep queue mixed IO.
ADQ Read?
Avg. 4K-64Thread Read Speed
249 MB/s Slightly faster deep queue read.
227 MB/s -10%
ADQ Write?
Avg. 4K-64Thread Write Speed
240 MB/s Faster deep queue write.
206 MB/s -17%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
54.8 MB/s -6% 58 MB/s Slightly 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 User Rankings Chart

October 2014 SSD Rankings

Welcome to our consumer SSD comparison. We calculate effective speed which measures performance for typical consumers. Effective speed is adjusted 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. Vote to share your opinion. [SSDrivePro]

Group Test Results

How Fast Is Your SSD?

Size up your PC in less than a minute.

Welcome to our free PC speed test tool. UserBenchMark will compare the strengths and weaknesses of each component in your PC to the ten most popular components in its class.

How it works

  • - Download and run UserBenchMark (UBM)
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - Drive benchmarks include: read, write and mixed IO.
  • - CPU benchmarks include: integer, floating and string.
  • - GPU benchmarks include: DX9 and DX10 3D performance.
  • - 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
  • - Share your opinion by voting

Frequently Asked Questions


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The Best.
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SanDisk Extreme USB 3.0 64GBSamsung 850 Pro 256GBAMD FX-8350Seagate Barracuda 7200.14 3TBAMD R9 270X
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