Controller: Samsung Triple Core MEX. Memory: Samsung 40nm MLC V-NAND

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

Real World Speed
Performance profile from 23,314 user samples
14,230 User Benchmarks
Best Bench: 122% 119GB free
Worst Bench: 75% 64GB free
Poor: 75% Great: 122%
SPEED RANK: 39th / 814
9,084 User Benchmarks
Best Bench: 107% 214GB free
Worst Bench: 56% 2GB free
Poor: 56% Great: 107%
SPEED RANK: 125th / 814
Effective Speed
Effective SSD Speed
99.8 % Faster effective speed.
83.2 % -20%
Avg. Sequential Read Speed
508 MB/s +4% 488 MB/s -4%
Avg. Sequential Write Speed
451 MB/s Faster write speed.
348 MB/s -30%
4K Read
Avg. 4K Random Read Speed
31.9 MB/s Slightly faster random read.
28.9 MB/s -10%
4K Write
Avg. 4K Random Write Speed
89 MB/s Slightly faster random write.
77.7 MB/s -15%
Avg. Sequential Mixed IO Speed
474 MB/s Faster mixed IO speed.
381 MB/s -24%
4K Mixed
Avg. 4K Random Mixed IO Speed
33.4 MB/s Much faster random mixed IO.
22.1 MB/s -51%
Peak Sequential Read Speed
528 MB/s +1% 522 MB/s -1%
Peak Sequential Write Speed
502 MB/s +2% 491 MB/s -2%
4K Read
Peak 4K Random Read Speed
39.3 MB/s Slightly faster peak random read.
36.5 MB/s -8%
4K Write
Peak 4K Random Write Speed
128 MB/s Slightly faster peak random write.
117 MB/s -9%
Peak Sequential Mixed IO Speed
514 MB/s +1% 508 MB/s -1%
4K Mixed
Peak 4K Random Mixed IO Speed
48.3 MB/s Much faster peak random mixed IO.
28.7 MB/s -68%
Market Share
Based on 1,905,939 SSDs tested.
Market Share
Market Share (trailing 30 days)
1.6 % Much higher market share.
1 % -60%
Value For Money
85.1 % Hugely better value.
44.4 % -92%
User Rating
UBM User Rating
90 % Much more popular.
62 % -45%
Price (score)
$120 Much cheaper.
$224 -46%
30 Months Much more recent.
51 Months -41%
DQ Read
Peak 4K-64Thread Read Speed
382 MB/s +2% 373 MB/s -2%
DQ Write
Peak 4K-64Thread Write Speed
345 MB/s Slightly faster peak deep queue write.
321 MB/s -7%
AS-SSD Total
AS-SSD Total Score
1,253 Pts +5% 1,196 Pts -5%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
166 MB/s Hugely faster peak deep queue mixed IO.
89.1 MB/s -86%
ADQ Read
Avg. 4K-64Thread Read Speed
213 MB/s +4% 205 MB/s -4%
ADQ Write
Avg. 4K-64Thread Write Speed
237 MB/s Faster deep queue write.
195 MB/s -22%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
94.2 MB/s Much faster deep queue mixed IO.
54.5 MB/s -73%
256GB 256GB

The 256GB Samsung 850 Pro is the fastest consumer SSD we have seen to date. Thanks to Samsung's new 3D V-NAND the 850 Pro has lower power consumption and better performance, albeit marginally, than both the 840 Evo and 840 Pro. Looking at the benchmark figures for the 840 and 850 Pros shows that the effective performance improvement is 10% whereas the 850 Pro beats the 840 Evo by 16%. These drives effectively saturate SATA 3.0 making it difficult to distinguish between them in day-to-day use. At current prices the 850 Pro is prohibitively expensive, prices need to drop by 15% before it approaches the 840 Pro from a value perspective. Samsung may release a value orientated 850 Evo soon, but for now "most" users are better off with the 840 Pro. [Oct '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) January 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


The Best.
Intel Core i7-6700K $330Nvidia GTX 1070 $376Samsung 850 Evo 250GB $98
Intel Core i5-6600K $220AMD RX 480 $190Samsung 850 Pro 256GB $120
Intel Core i7-4790K $339Nvidia GTX 1060-6GB $250Samsung 850 Evo 500GB $150
Seagate Barracuda 7200.14 1TB $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $103SanDisk Extreme 64GB $28
WD Black 6TB (2015) $270G.SKILL Trident Z DDR4 3200 C14 4x16GB $545SanDisk Extreme 32GB $23
WD Blue 1TB (2012) $50G.SKILL Trident Z DDR4 3200 C16 2x8GB $110SanDisk Extreme 16GB $16
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