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

Controller: Marvell 88SS9187. Memory: SanDisk 19nm TLC.

Real World Speed
Performance profile from 16,343 user samples
3,945 User Benchmarks
Best Bench: 106% 151GB free
Worst Bench: 65% 160GB free
Poor: 65% Great: 106%
SPEED RANK: 115th / 873
12,398 User Benchmarks
Best Bench: 84% 152GB free
Worst Bench: 46% 7GB free
Poor: 46% Great: 84%
SPEED RANK: 421st / 873
Effective Speed
Effective SSD Speed
86.8 % Much faster effective speed.
65.7 % -32%
Avg. Sequential Read Speed
493 MB/s Slightly faster read speed.
453 MB/s -9%
Avg. Sequential Write Speed
421 MB/s Much faster write speed.
250 MB/s -68%
4K Read
Avg. 4K Random Read Speed
29.5 MB/s Slightly faster random read.
27.3 MB/s -8%
4K Write
Avg. 4K Random Write Speed
79.9 MB/s Much faster random write.
50.9 MB/s -57%
Avg. Sequential Mixed IO Speed
422 MB/s Much faster mixed IO speed.
241 MB/s -75%
4K Mixed
Avg. 4K Random Mixed IO Speed
21 MB/s Much faster random mixed IO.
14.6 MB/s -44%
Peak Sequential Read Speed
516 MB/s +4% 498 MB/s -4%
Peak Sequential Write Speed
493 MB/s Much faster peak write speed.
339 MB/s -45%
4K Read
Peak 4K Random Read Speed
35.9 MB/s -3% 37.1 MB/s +3%
4K Write
Peak 4K Random Write Speed
118 MB/s Much faster peak random write.
81.5 MB/s -45%
Peak Sequential Mixed IO Speed
486 MB/s Much faster peak mixed IO speed.
326 MB/s -49%
4K Mixed
Peak 4K Random Mixed IO Speed
29.1 MB/s Much faster peak random mixed IO.
21.3 MB/s -37%
Market Share
Based on 4,734,658 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.12 % -292% 0.47 % Hugely higher market share.
Value For Money
78 % +3% 76 % -3%
User Rating
UBM User Rating
65 % +3% 63 % -3%
Price (score)
$105 -29% $75 Cheaper.
42 Months -7% 39 Months Slightly more recent.
DQ Read
Peak 4K-64Thread Read Speed
361 MB/s -0% 362 MB/s +0%
DQ Write
Peak 4K-64Thread Write Speed
326 MB/s Much faster peak deep queue write.
209 MB/s -56%
AS-SSD Total
AS-SSD Total Score
1,183 Pts Stronger server IO.
1,008 Pts -17%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
65.4 MB/s Faster peak deep queue mixed IO.
51.4 MB/s -27%
ADQ Read
Avg. 4K-64Thread Read Speed
169 MB/s -8% 183 MB/s Slightly faster deep queue read.
ADQ Write
Avg. 4K-64Thread Write Speed
186 MB/s Much faster deep queue write.
133 MB/s -40%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
37.9 MB/s Faster deep queue mixed IO.
30.1 MB/s -26%
240GB 240GB

The 240GB Sandisk Extreme Pro uses the same controller and NAND as its 13 months younger predecessor, the Extreme II. Comparing the Extreme II and Extreme Pro shows that average performance has increased by 10% but peak performance remains broadly unchanged. The Pro features an improved nCache which uses an SLC buffer to cache writes prior to writing them to the slower MLC NAND. In order to benefit from this improved caching, huge amounts of data need to be written for extended periods, an unlikely consumer scenario. Comparing core performance between the Samsung 840 Evo and Extreme Pro shows that the Extreme Pro averages around 12% faster than the Evo. The Extreme Pro also has a 10 year warranty but I wonder if SATA 3 will even be around at that time. Although the Extreme Pro has a superb performance profile it's not a game changer. [Jun '14 SSDrivePro]


The Sandisk Ultra II sits above Sandisk's Ultra Plus and below their Extreme Pro. The Ultra Plus would probably have been phased out completely were it not for its continued success within budget space. The Ultra II is the first Sandisk drive to utilize cheaper (and slower) TLC NAND. Similarly to the Extreme Pro, the Ultra II utilizes an nCache which operates a portion of the NAND in simulated SLC mode. This strategy also matches the one employed by Samsung's now 14 months old Evo. Comparing the Ultra II and Evo shows broad performance equivalence which given the Ultra II's 15% price discount makes it the better choice today. That said it's probably worth waiting for the release of the 850 Evo which will pack another 14 months of Samsung's market leading R&D and will probably steal the show. [Sep '14 SSDrivePro]


Solid State Drive Rankings (Price vs Performance) December 2017 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: six 3D game simulations.
  • - 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.

 Frequently Asked Questions

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The Best.
Intel Core i7-7700K $280Nvidia GTX 1070 $430Samsung 850 Evo 250GB $88
AMD Ryzen 7 1700 $285AMD RX 480 $265Samsung 850 Pro 256GB $113
Intel Core i5-7600K $215Nvidia GTX 1060-6GB $260Samsung 850 Evo 500GB $140
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $205SanDisk Extreme 64GB $41
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $1,050SanDisk Extreme 32GB $22
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $215SanDisk Ultra Fit 32GB $10
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