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

Controller: Marvell 88SS9187. Memory: SanDisk 19nm TLC.

Real World Speed
Performance profile from 23,117 user samples
17,024 User Benchmarks
Best Bench: 125% 192GB free
Worst Bench: 74% 163GB free
Poor: 74% Great: 125%
SPEED RANK: 47th / 848
6,093 User Benchmarks
Best Bench: 83% 75GB free
Worst Bench: 45% 37GB free
Poor: 45% Great: 83%
SPEED RANK: 405th / 848
Effective Speed
Effective SSD Speed
101 % Much faster effective speed.
65.2 % -55%
Avg. Sequential Read Speed
507 MB/s Slightly faster read speed.
448 MB/s -13%
Avg. Sequential Write Speed
443 MB/s Hugely faster write speed.
241 MB/s -84%
4K Read
Avg. 4K Random Read Speed
32.9 MB/s Faster random read.
27 MB/s -22%
4K Write
Avg. 4K Random Write Speed
91.5 MB/s Much faster random write.
51.1 MB/s -79%
Avg. Sequential Mixed IO Speed
466 MB/s Hugely faster mixed IO speed.
236 MB/s -97%
4K Mixed
Avg. 4K Random Mixed IO Speed
35.2 MB/s Hugely faster random mixed IO.
14.6 MB/s -141%
Peak Sequential Read Speed
529 MB/s Slightly faster peak read speed.
496 MB/s -7%
Peak Sequential Write Speed
502 MB/s Much faster peak write speed.
334 MB/s -50%
4K Read
Peak 4K Random Read Speed
41.2 MB/s Faster peak random read.
35.7 MB/s -15%
4K Write
Peak 4K Random Write Speed
130 MB/s Much faster peak random write.
83.1 MB/s -56%
Peak Sequential Mixed IO Speed
514 MB/s Much faster peak mixed IO speed.
323 MB/s -59%
4K Mixed
Peak 4K Random Mixed IO Speed
50.5 MB/s Hugely faster peak random mixed IO.
21 MB/s -140%
Market Share
Based on 2,355,258 SSDs tested.
Market Share
Market Share (trailing 30 days)
1.5 % Hugely higher market share.
0.6 % -150%
Value For Money
77.5 % Slightly better value.
68.6 % -13%
User Rating
UBM User Rating
96 % Much more popular.
65 % -48%
Price (score)
$138 -38% $85 Much cheaper.
32 Months -6% 30 Months Slightly more recent.
DQ Read
Peak 4K-64Thread Read Speed
384 MB/s Slightly faster peak deep queue read.
356 MB/s -8%
DQ Write
Peak 4K-64Thread Write Speed
348 MB/s Much faster peak deep queue write.
212 MB/s -64%
AS-SSD Total
AS-SSD Total Score
1,265 Pts Stronger server IO.
1,000 Pts -26%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
168 MB/s Hugely faster peak deep queue mixed IO.
51.3 MB/s -227%
ADQ Read
Avg. 4K-64Thread Read Speed
222 MB/s Faster deep queue read.
193 MB/s -15%
ADQ Write
Avg. 4K-64Thread Write Speed
228 MB/s Much faster deep queue write.
137 MB/s -66%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
95.2 MB/s Hugely faster deep queue mixed IO.
30.5 MB/s -212%
256GB 240GB

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 Sandisk Ultra II sits above Sandisk's Ultra Plus and below their Extreme Pro. The Ultra Plus would probably have been phased out completely were it not for its continued success within budget space. The Ultra II is the first Sandisk drive to utilize cheaper (and slower) TLC NAND. Similarly to the Extreme Pro, the Ultra II utilizes an nCache which operates a portion of the NAND in simulated SLC mode. This strategy also matches the one employed by Samsung's now 14 months old Evo. Comparing the Ultra II and Evo shows broad performance equivalence which given the Ultra II's 15% price discount makes it the better choice today. That said it's probably worth waiting for the release of the 850 Evo which will pack another 14 months of Samsung's market leading R&D and will probably steal the show. [Sep '14 SSDrivePro]


Solid State Drive Rankings (Price vs Performance) March 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

 Best User Rated

The Best.
Intel Core i7-7700K $310Nvidia GTX 1070 $370Samsung 850 Evo 250GB $94
AMD Ryzen 7 1700 $325AMD RX 480 $193Samsung 850 Pro 256GB $138
Intel Core i5-7600K $215Nvidia GTX 1060-6GB $235Samsung 850 Evo 500GB $160
Seagate Barracuda 1TB (2016) $50Corsair Vengeance LPX DDR4 3000 C15 2x8GB $110SanDisk Extreme 64GB $34
Seagate Barracuda 3TB (2016) $90G.SKILL Trident Z DDR4 3200 C14 4x16GB $650SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $50Corsair Vengeance LPX DDR4 3200 C16 2x8GB $130SanDisk Ultra Fit 32GB $9
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