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

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

Real World Speed
Performance profile from 50,763 user samples
37,133 User Benchmarks
Best Bench: 121% 182GB free
Worst Bench: 71% 141GB free
Poor: 71% Great: 121%
SPEED RANK: 80th / 911
13,630 User Benchmarks
Best Bench: 81% 28GB free
Worst Bench: 47% 186GB free
Poor: 47% Great: 81%
SPEED RANK: 473rd / 911
Effective Speed
Effective SSD Speed
98.3 % Much faster effective speed.
64.1 %
Avg. Sequential Read Speed
502 MB/s Slightly faster read speed.
454 MB/s
Avg. Sequential Write Speed
441 MB/s Hugely faster write speed.
237 MB/s
4K Read
Avg. 4K Random Read Speed
32.6 MB/s Faster random read.
27.1 MB/s
4K Write
Avg. 4K Random Write Speed
85.9 MB/s Much faster random write.
48.2 MB/s
Avg. Sequential Mixed IO Speed
460 MB/s Hugely faster mixed IO speed.
234 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed
34.4 MB/s Hugely faster random mixed IO.
14.3 MB/s
Peak Sequential Read Speed
528 MB/s Slightly faster peak read speed.
498 MB/s
Peak Sequential Write Speed
502 MB/s Much faster peak write speed.
340 MB/s
4K Read
Peak 4K Random Read Speed
42.1 MB/s Faster peak random read.
36.6 MB/s
4K Write
Peak 4K Random Write Speed
121 MB/s Much faster peak random write.
76.6 MB/s
Peak Sequential Mixed IO Speed
513 MB/s Much faster peak mixed IO speed.
331 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed
50.8 MB/s Hugely faster peak random mixed IO.
20.8 MB/s
Market Share
Based on 6,060,410 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.75 % Much higher market share.
0.45 %
Value For Money
75.2 % +1% 74.1 %
User Rating
UBM User Rating
99 % Much more popular.
64 %
Price (score)
$139 $75 Much cheaper.
44 Months 42 Months +5%
DQ Read
Peak 4K-64Thread Read Speed
375 MB/s Slightly faster peak deep queue read.
349 MB/s
DQ Write
Peak 4K-64Thread Write Speed
336 MB/s Much faster peak deep queue write.
206 MB/s
AS-SSD Total
AS-SSD Total Score
1,232 Pts Stronger server IO.
980 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
163 MB/s Hugely faster peak deep queue mixed IO.
51.4 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed
196 MB/s Slightly faster deep queue read.
175 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed
211 MB/s Much faster deep queue write.
130 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
88 MB/s Hugely faster deep queue mixed IO.
31.1 MB/s
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 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 $447Samsung 850 Evo 250GB $85
Intel Core i7-7700K $290Nvidia GTX 1060-6GB $335Samsung 850 Evo 500GB $150
AMD Ryzen 5 1600 $188AMD RX 480 $400Samsung 850 Pro 256GB $139
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $190SanDisk Extreme 64GB $44
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $931SanDisk Extreme 32GB $23
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $216SanDisk Extreme 16GB $18
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