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 805 user samples
82 User Benchmarks:
Best Score: 133% 203GB free
Worst Score: 75% 141GB free
Worst: 75% Best: 133%
SPEED RANK: 30th / 532
723 User Benchmarks:
Best Score: 140% 146GB free
Worst Score: 49% 3GB free
Worst: 49% Best: 140%
SPEED RANK: 35th / 532
Avg. Sequential Read Speed
449 MB/s -10% 494 MB/s Slightly faster read speed.
Avg. Sequential Write Speed
423 MB/s Slightly faster write speed.
397 MB/s -7%
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 +3% 71.8 MB/s -3%
Avg. Sequential Mixed IO Speed
388 MB/s -7% 414 MB/s Slightly faster mixed IO speed.
4K Mixed
Avg. 4K Random Mixed IO Speed
21.5 MB/s -1% 21.7 MB/s +1%
Peak Sequential Read Speed
485 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 MB/s -4% 36.4 MB/s +4%
4K Write?
Peak 4K Random Write Speed
124 MB/s Slightly faster peak random write.
118 MB/s -5%
Peak Sequential Mixed IO Speed
454 MB/s -12% 509 MB/s Slightly faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
29 MB/s +2% 28.5 MB/s -2%
Value For Money
75 % -33% 99.5 % Much better value.
User Rating?
UBM User Rating
63 % -30% 82 % Much more popular.
Price (score)
$206 -32% $140 Much cheaper.
Effective Speed?
Effective SSD Speed
472 MB/s -3% 484 MB/s +3%
18 Months More recent.
25 Months -28%
DQ Read?
Peak 4K-64Thread Read Speed
369 MB/s -2% 378 MB/s +2%
DQ Write?
Peak 4K-64Thread Write Speed
305 MB/s -4% 316 MB/s +4%
AS-SSD Total?
AS-SSD Total Score
1,174 Pts -2% 1,201 Pts +2%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
67.2 MB/s -34% 90 MB/s Much faster peak deep queue mixed IO.
ADQ Read?
Avg. 4K-64Thread Read Speed
244 MB/s Slightly faster deep queue read.
221 MB/s -10%
ADQ Write?
Avg. 4K-64Thread Write Speed
231 MB/s Slightly faster deep queue write.
201 MB/s -15%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
53.9 MB/s -5% 56.6 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

November 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.
SanDisk Extreme USB 3.0 16GBSamsung 840 Evo 250GBAMD FX-8350WD Black 1TB (2013)Nvidia GTX 970
SanDisk Extreme USB 3.0 32GBSamsung 840 Pro 256GBIntel Core i7-4790KSeagate Desktop SSHD 1TBNvidia GTX 770
SanDisk Extreme USB 3.0 64GBCrucial MX100 256GBAMD FX-6300WD Black 2TB (2013)AMD R9 280
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