Controller: Silicon Motion SM2258. Flash Memory: Micron 3D TLC.

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

Real World Speed
Performance profile from 38,142 user samples
46 User Benchmarks
Best Bench: 104% 2TB free
Worst Bench: 69% 1.5TB free
Poor: 69% Great: 104%
SPEED RANK: 128th / 908
38,096 User Benchmarks
Best Bench: 120% 182GB free
Worst Bench: 71% 141GB free
Poor: 71% Great: 120%
SPEED RANK: 79th / 908
Effective Speed
Effective SSD Speed
87.4 % 98.7 % Slightly faster effective speed.
Avg. Sequential Read Speed
493 MB/s 504 MB/s +2%
Avg. Sequential Write Speed
377 MB/s 446 MB/s Faster write speed.
4K Read
Avg. 4K Random Read Speed
30.2 MB/s 32.5 MB/s Slightly faster random read.
4K Write
Avg. 4K Random Write Speed
68.1 MB/s 86.3 MB/s Faster random write.
Avg. Sequential Mixed IO Speed
394 MB/s 465 MB/s Faster mixed IO speed.
4K Mixed
Avg. 4K Random Mixed IO Speed
29.2 MB/s 34.5 MB/s Faster random mixed IO.
Peak Sequential Read Speed
528 MB/s 528 MB/s
Peak Sequential Write Speed
404 MB/s 502 MB/s Faster peak write speed.
4K Read
Peak 4K Random Read Speed
40 MB/s 41.7 MB/s +4%
4K Write
Peak 4K Random Write Speed
103 MB/s 122 MB/s Faster peak random write.
Peak Sequential Mixed IO Speed
427 MB/s 514 MB/s Faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
44.6 MB/s 50.1 MB/s Slightly faster peak random mixed IO.
Market Share
Based on 6,032,923 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.01 % 0.77 % Insanely higher market share.
Value For Money
134 % Hugely better value.
67.8 %
User Rating
UBM User Rating
67 % 100 % Much more popular.
Price (score)
$430 $160 Much cheaper.
2 Months Hugely more recent.
44 Months
DQ Read
Peak 4K-64Thread Read Speed
370 MB/s 377 MB/s +2%
DQ Write
Peak 4K-64Thread Write Speed
284 MB/s 336 MB/s Faster peak deep queue write.
AS-SSD Total
AS-SSD Total Score
1,135 Pts 1235 Pts Slightly stronger server IO.
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
84.3 MB/s 163 MB/s Hugely faster peak deep queue mixed IO.
ADQ Read
Avg. 4K-64Thread Read Speed
204 MB/s Slightly faster deep queue read.
191 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed
178 MB/s 212 MB/s Faster deep queue write.
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
57.7 MB/s 86.7 MB/s Much faster deep queue mixed IO.
2TB 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]


Solid State Drive Rankings (Price vs Performance) March 2018 SSD Rankings.

Welcome to our 2.5" and M.2 SSD comparison. We calculate effective speed for both SATA and NVMe drives based on real world performance then adjust by current prices per GB to yield a value for money rating. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top SSDs. [SSDrivePro]


Group Test Results

  • Best user rated - Sometimes benchmarks get it completely wrong...
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
  • Best value for money - Value for money is based on real world performance, price and capacity.
  • Raw speed comparison - Raw speed readings.
  • Details ordered by value - Detailed performance stats ordered by overall value for money.
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

 Best User Rated

The Best.
Intel Core i7-8700K $330Nvidia GTX 1070 $117Samsung 850 Evo 250GB $85
Intel Core i7-7700K $290Nvidia GTX 1060-6GB $335Samsung 850 Evo 500GB $141
Intel Core i5-8600K $235AMD RX 480 $400Samsung 850 Pro 256GB $160
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $170SanDisk Extreme 64GB $44
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $931SanDisk Extreme 32GB $23
Seagate Barracuda 7200.14 1TB $51Corsair Vengeance LPX DDR4 3200 C16 2x8GB $205SanDisk Extreme 16GB $18
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