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 271 user samples
Worst: 55% Best: 99%
SPEED RANK: 32nd / 682
Worst: 20% Best: 118%
SPEED RANK: 51st / 682
Avg. Sequential Read Speed
436 MB/s -3% 449 MB/s +3%
Avg. Sequential Write Speed
423 MB/s Slightly faster write speed.
372 MB/s -14%
4K Read?
Avg. 4K Random Read Speed
27.5 MB/s +0% 27.4 MB/s -0%
4K Write?
Avg. 4K Random Write Speed
66.5 MB/s +1% 65.7 MB/s -1%
Avg. Sequential Mixed IO Speed
379 MB/s -2% 385 MB/s +2%
4K Mixed
Avg. 4K Random Mixed IO Speed
22.5 MB/s +4% 21.7 MB/s -4%
Peak Sequential Read Speed
527 MB/s +1% 524 MB/s -1%
Peak Sequential Write Speed
492 MB/s -3% 505 MB/s +3%
4K Read?
Peak 4K Random Read Speed
37 MB/s -3% 38 MB/s +3%
4K Write?
Peak 4K Random Write Speed
134 MB/s Slightly faster peak random write.
124 MB/s -8%
Peak Sequential Mixed IO Speed
466 MB/s -9% 507 MB/s Slightly faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
28.6 MB/s +3% 27.9 MB/s -3%
Value For Money
83.5 % +1% 83 % -1%
User Rating?
UBM User Rating
78 % -14% 89 % Slightly more popular.
Price (score)
145 GBP Slightly cheaper.
158 GBP -8%
Effective Speed?
Effective SSD Speed
570 MB/s -1% 579 MB/s +1%
11 Months Much more recent.
18 Months -39%
DQ Read?
Peak 4K-64Thread Read Speed
351 MB/s -9% 384 MB/s Slightly faster peak deep queue read.
DQ Write?
Peak 4K-64Thread Write Speed
278 MB/s -17% 326 MB/s Faster peak deep queue write.
AS-SSD Read?
AS-SSD Read Score
442 Pts -7% 475 Pts Slightly stronger server read.
AS-SSD Write?
AS-SSD Write Score
463 Pts -8% 501 Pts Slightly stronger server write.
AS-SSD Total?
AS-SSD Total Score
1,143 Pts -8% 1,232 Pts Slightly stronger server IO.
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
67.9 MB/s -33% 90.1 MB/s Much faster peak deep queue mixed IO.
ADQ Read?
Avg. 4K-64Thread Read Speed
277 MB/s Faster deep queue read.
227 MB/s -22%
ADQ Write?
Avg. 4K-64Thread Write Speed
236 MB/s Faster deep queue write.
203 MB/s -16%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
58.3 MB/s -3% 59.9 MB/s +3%
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

April 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

Best User Rated SSDs

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