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 16,438 user samples
2,409 User Benchmarks
Best Bench: 106% 95GB free
Worst Bench: 62% 105GB free
Poor: 62% Great: 106%
SPEED RANK: 115th / 853
14,029 User Benchmarks
Best Bench: 108% 238GB free
Worst Bench: 53% 32GB free
Poor: 53% Great: 108%
SPEED RANK: 158th / 853
Effective Speed
Effective SSD Speed
85.4 % +4% 82.3 % -4%
Avg. Sequential Read Speed
478 MB/s -3% 490 MB/s +3%
Avg. Sequential Write Speed
414 MB/s Faster write speed.
342 MB/s -21%
4K Read
Avg. 4K Random Read Speed
28.3 MB/s -2% 28.9 MB/s +2%
4K Write
Avg. 4K Random Write Speed
73.1 MB/s -6% 77.8 MB/s Slightly faster random write.
Avg. Sequential Mixed IO Speed
417 MB/s Slightly faster mixed IO speed.
375 MB/s -11%
4K Mixed
Avg. 4K Random Mixed IO Speed
22.4 MB/s +1% 22.1 MB/s -1%
Peak Sequential Read Speed
515 MB/s -1% 522 MB/s +1%
Peak Sequential Write Speed
493 MB/s +0% 491 MB/s -0%
4K Read
Peak 4K Random Read Speed
36.3 MB/s 0% 36.3 MB/s 0%
4K Write
Peak 4K Random Write Speed
118 MB/s +1% 117 MB/s -1%
Peak Sequential Mixed IO Speed
484 MB/s -5% 508 MB/s +5%
4K Mixed
Peak 4K Random Mixed IO Speed
30.1 MB/s +4% 28.9 MB/s -4%
Market Share
Based on 3,271,260 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.17 % -353% 0.77 % Hugely higher market share.
Value For Money
76.7 % Much better value.
50.1 % -53%
User Rating
UBM User Rating
65 % +2% 64 % -2%
Price (score)
$105 Much cheaper.
$188 -44%
37 Months Much more recent.
57 Months -35%
DQ Read
Peak 4K-64Thread Read Speed
365 MB/s -2% 371 MB/s +2%
DQ Write
Peak 4K-64Thread Write Speed
322 MB/s +1% 318 MB/s -1%
AS-SSD Total
AS-SSD Total Score
1,186 Pts -0% 1,190 Pts +0%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
65 MB/s -36% 88.5 MB/s Much faster peak deep queue mixed IO.
ADQ Read
Avg. 4K-64Thread Read Speed
193 MB/s +2% 189 MB/s -2%
ADQ Write
Avg. 4K-64Thread Write Speed
178 MB/s -3% 184 MB/s +3%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
47.1 MB/s -12% 52.8 MB/s Slightly faster deep queue mixed IO.
240GB 256GB

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 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 Rankings (Price vs Performance) July 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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Intel Core i7-7700K $295Nvidia GTX 1070 $390Samsung 850 Evo 250GB $97
AMD Ryzen 7 1700 $268AMD RX 480 $260Samsung 850 Pro 256GB $136
Intel Core i5-7600K $224Nvidia GTX 1060-6GB $239Samsung 850 Evo 500GB $165
Seagate Barracuda 1TB (2016) $50G.SKILL Trident Z DDR4 3200 C14 4x16GB $714SanDisk Extreme 64GB $34
Seagate Barracuda 3TB (2016) $83Corsair Vengeance LPX DDR4 3000 C15 2x8GB $132SanDisk Extreme 32GB $23
Seagate Barracuda 7200.14 1TB $44HyperX Fury DDR4 2133 C14 2x8GB $133SanDisk Ultra Fit 32GB $13
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