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 1797 user samples
152 User Benchmarks
Best Bench: 118% 168GB free
Worst Bench: 33% 103GB free
Worst: 33% Best: 118%
SPEED RANK: 54th / 666
1645 User Benchmarks
Best Bench: 121% 160GB free
Worst Bench: 37% 5GB free
Worst: 37% Best: 121%
SPEED RANK: 60th / 666
Effective Speed
Effective SSD Speed
90.7 % +1% 89.9 % -1%
Avg. Sequential Read Speed
443 MB/s -11% 492 MB/s Slightly faster read speed.
Avg. Sequential Write Speed
413 MB/s Slightly faster write speed.
385 MB/s -7%
4K Read
Avg. 4K Random Read Speed
27.9 MB/s -3% 28.6 MB/s +3%
4K Write
Avg. 4K Random Write Speed
78.5 MB/s Slightly faster random write.
72.8 MB/s -8%
Avg. Sequential Mixed IO Speed
379 MB/s -7% 404 MB/s Slightly faster mixed IO speed.
4K Mixed
Avg. 4K Random Mixed IO Speed
21 MB/s -3% 21.6 MB/s +3%
Peak Sequential Read Speed
488 MB/s -8% 525 MB/s Slightly faster peak read speed.
Peak Sequential Write Speed
487 MB/s -2% 497 MB/s +2%
4K Read
Peak 4K Random Read Speed
36.9 MB/s +1% 36.6 MB/s -1%
4K Write
Peak 4K Random Write Speed
132 MB/s Slightly faster peak random write.
118 MB/s -12%
Peak Sequential Mixed IO Speed
454 MB/s -12% 508 MB/s Slightly faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
29.3 MB/s +3% 28.4 MB/s -3%
Value For Money
59.6 % -7% 63.6 % Slightly better value.
User Rating
UBM User Rating
69 % -3% 71 % +3%
Price (score)
$202 -1% $200 +1%
24 Months More recent.
31 Months -23%
DQ Read
Peak 4K-64Thread Read Speed
368 MB/s -3% 378 MB/s +3%
DQ Write
Peak 4K-64Thread Write Speed
302 MB/s -4% 315 MB/s +4%
AS-SSD Total
AS-SSD Total Score
1,182 Pts -2% 1,200 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
215 MB/s +2% 210 MB/s -2%
ADQ Write
Avg. 4K-64Thread Write Speed
213 MB/s Slightly faster deep queue write.
193 MB/s -10%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
47.2 MB/s -17% 55 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]


How Fast Is Your SSD? (Bench your build) 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
Custom PC Builder (Start a new build) Compare component prices, popularity, speed and value for money.

PC Builder will help you build your perfect PC by clearly presenting relevant performance statistics together with price, compatibility and popularity data.

Frequently Asked Questions


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