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

Controller: Samsung Dual Core MGX. Memory: Samsung 40nm TLC V-NAND

Real World Speed
Performance profile from 102,632 user samples
1,924 User Benchmarks
Best Bench: 106% 82GB free
Worst Bench: 61% 113GB free
Poor: 61% Great: 106%
SPEED RANK: 118th / 848
100,708 User Benchmarks
Best Bench: 117% 173GB free
Worst Bench: 71% 153GB free
Poor: 71% Great: 117%
SPEED RANK: 54th / 848
Effective Speed
Effective SSD Speed
84.9 % -12% 95.1 % Slightly faster effective speed.
Avg. Sequential Read Speed
475 MB/s -5% 497 MB/s +5%
Avg. Sequential Write Speed
418 MB/s Slightly faster write speed.
391 MB/s -7%
4K Read
Avg. 4K Random Read Speed
27.6 MB/s -39% 38.3 MB/s Much faster random read.
4K Write
Avg. 4K Random Write Speed
73.3 MB/s -8% 79.3 MB/s Slightly faster random write.
Avg. Sequential Mixed IO Speed
417 MB/s Slightly faster mixed IO speed.
395 MB/s -6%
4K Mixed
Avg. 4K Random Mixed IO Speed
21.7 MB/s -53% 33.1 MB/s Much faster random mixed IO.
Peak Sequential Read Speed
515 MB/s -0% 517 MB/s +0%
Peak Sequential Write Speed
488 MB/s Faster peak write speed.
417 MB/s -17%
4K Read
Peak 4K Random Read Speed
36.2 MB/s -34% 48.6 MB/s Much faster peak random read.
4K Write
Peak 4K Random Write Speed
116 MB/s +5% 111 MB/s -5%
Peak Sequential Mixed IO Speed
484 MB/s Slightly faster peak mixed IO speed.
422 MB/s -15%
4K Mixed
Peak 4K Random Mixed IO Speed
29.9 MB/s -63% 48.7 MB/s Much faster peak random mixed IO.
Market Share
Based on 2,595,267 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.1 % -7,600% 7.7 % Insanely higher market share.
Value For Money
76.3 % -14% 87.1 % Slightly better value.
User Rating
UBM User Rating
64 % -69% 108 % Much more popular.
Price (score)
$105 +1% $106 -1%
34 Months -18% 28 Months More recent.
DQ Read
Peak 4K-64Thread Read Speed
363 MB/s -4% 379 MB/s +4%
DQ Write
Peak 4K-64Thread Write Speed
325 MB/s Slightly faster peak deep queue write.
287 MB/s -13%
AS-SSD Total
AS-SSD Total Score
1,183 Pts +0% 1,178 Pts -0%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
65.4 MB/s -80% 118 MB/s Hugely faster peak deep queue mixed IO.
ADQ Read
Avg. 4K-64Thread Read Speed
179 MB/s -7% 191 MB/s Slightly faster deep queue read.
ADQ Write
Avg. 4K-64Thread Write Speed
192 MB/s +4% 185 MB/s -4%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
45.3 MB/s -47% 66.6 MB/s Much faster deep queue mixed IO.
240GB 250GB

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 250GB Samsung 850 Evo has a similar architecture to its hugely successful predecessor, the 840 Evo. Both drives are TLC based but the 850 uses 3D V-NAND as opposed to regular NAND. Both drives also feature a Turbowrite cache (TWC) which buffers up to 3GB of writes. The TWC enables high burst write speeds but when the cache exhausts write speeds drop to 300 MB/s. Comparing the 850 and 840 Evos shows that effective speed, has improved by 11% and the warranty has been extended from three to five years but prices are also up by 11%. The 850 Evo does put in superb benchmarks (second only to the 850 Pro) but these are only valid within the TWC. At current price levels the 850 Evo struggles to compete with the value leaders[Dec '14 SSDrivePro]


Solid State Drive Rankings (Price vs Performance) April 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 $310Nvidia GTX 1070 $330Samsung 850 Evo 250GB $106
Intel Core i5-7600K $229AMD RX 480 $217Samsung 850 Pro 256GB $140
Intel Pentium G4560 $60Nvidia GTX 1060-6GB $219Samsung 850 Evo 500GB $170
Seagate Barracuda 1TB (2016) $50Corsair Vengeance LPX DDR4 3000 C15 2x8GB $122SanDisk Extreme 64GB $35
Seagate Barracuda 3TB (2016) $90G.SKILL Trident Z DDR4 3200 C14 4x16GB $700SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $46Corsair Vengeance LPX DDR4 3200 C16 2x8GB $137SanDisk Ultra Fit 32GB $9
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