Controller: Samsung 3-core MDX. Flash Memory: Samsung 21nm Toggle Mode MLC.

Controller: Marvell 88SS9189. Flash Memory: Micron 16nm MLC.

Real World Speed
Performance profile from 23,102 user samples
17,044 User Benchmarks
Best Bench: 110% 96GB free
Worst Bench: 56% 26GB free
Poor: 56% Great: 110%
SPEED RANK: 123rd / 862
6,058 User Benchmarks
Best Bench: 100% 47GB free
Worst Bench: 59% 97GB free
Poor: 59% Great: 100%
SPEED RANK: 159th / 862
Effective Speed
Effective SSD Speed
85.7 % +4% 82.7 % -4%
Avg. Sequential Read Speed
492 MB/s -2% 503 MB/s +2%
Avg. Sequential Write Speed
371 MB/s +2% 365 MB/s -2%
4K Read
Avg. 4K Random Read Speed
29.2 MB/s Slightly faster random read.
26.9 MB/s -9%
4K Write
Avg. 4K Random Write Speed
80.5 MB/s Slightly faster random write.
70.5 MB/s -14%
Avg. Sequential Mixed IO Speed
403 MB/s Slightly faster mixed IO speed.
376 MB/s -7%
4K Mixed
Avg. 4K Random Mixed IO Speed
22.5 MB/s -5% 23.7 MB/s Slightly faster random mixed IO.
Peak Sequential Read Speed
524 MB/s -1% 527 MB/s +1%
Peak Sequential Write Speed
499 MB/s Faster peak write speed.
399 MB/s -25%
4K Read
Peak 4K Random Read Speed
36.6 MB/s Slightly faster peak random read.
32.9 MB/s -11%
4K Write
Peak 4K Random Write Speed
117 MB/s Faster peak random write.
100 MB/s -17%
Peak Sequential Mixed IO Speed
510 MB/s Faster peak mixed IO speed.
415 MB/s -23%
4K Mixed
Peak 4K Random Mixed IO Speed
29.4 MB/s -16% 34.1 MB/s Faster peak random mixed IO.
Market Share
Based on 4,432,791 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.56 % Hugely higher market share.
0.24 % -133%
Value For Money
50 % Better value.
39.9 % -25%
User Rating
UBM User Rating
64 % -6% 68 % Slightly more popular.
Price (score)
$199 Cheaper.
$250 -20%
61 Months -44% 34 Months Much more recent.
DQ Read
Peak 4K-64Thread Read Speed
375 MB/s Slightly faster peak deep queue read.
357 MB/s -5%
DQ Write
Peak 4K-64Thread Write Speed
326 MB/s Faster peak deep queue write.
275 MB/s -19%
AS-SSD Total
AS-SSD Total Score
1,206 Pts Slightly stronger server IO.
1,089 Pts -11%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
90.8 MB/s Much faster peak deep queue mixed IO.
66.7 MB/s -36%
ADQ Read
Avg. 4K-64Thread Read Speed
208 MB/s Faster deep queue read.
177 MB/s -18%
ADQ Write
Avg. 4K-64Thread Write Speed
201 MB/s Faster deep queue write.
173 MB/s -16%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
54.4 MB/s Much faster deep queue mixed IO.
41 MB/s -33%
256GB 250GB

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]


The 250GB Crucial MX200 is successor to the hugely successful MX100. Both drives use the same NAND and controller but the new MX200 features Dynamic Write Acceleration (DWA) which is a new dynamically sized SLC cache. Samsung were the first to introduce SLC caching on the 840 Evo nearly two years ago so Crucial are somewhat late to the party. SLC caches generally only help performance in corner case real word scenarios and benchmarks. I prefer drives without SLC caches because they offer more consistent and sustainable real world IO. Comparing the MX100 and MX200 shows that the newer MX200 has a significantly faster peak write speed which is of course explained by the new DWA cache. Price is the deciding factor between the MX100 and MX200 so although the MX200 isn't priced aggressively yet, it will almost certainly move up the value rankings when retailers build stocks and subsequently cut prices. [Feb '15 SSDrivePro]


Solid State Drive Rankings (Price vs Performance) November 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 $288Nvidia GTX 1070 $410Samsung 850 Evo 250GB $90
AMD Ryzen 7 1700 $270AMD RX 480 $240Samsung 850 Pro 256GB $110
Intel Core i5-7600K $200Nvidia GTX 1060-6GB $260Samsung 850 Evo 500GB $150
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $189SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $1,050SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $55Corsair Vengeance LPX DDR4 3200 C16 2x8GB $195SanDisk Ultra Fit 32GB $12
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