Controller: Samsung Dual Core MGX. Memory: Samsung 40nm TLC V-NAND

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

Real World Speed
Performance profile from 221,613 user samples
209,182 User Benchmarks
Best Bench: 116% 203GB free
Worst Bench: 66% 215GB free
Poor: 66% Great: 116%
SPEED RANK: 68th / 873
12,431 User Benchmarks
Best Bench: 84% 152GB free
Worst Bench: 46% 134GB free
Poor: 46% Great: 84%
SPEED RANK: 425th / 873
Effective Speed
Effective SSD Speed
94.5 % Much faster effective speed.
65.6 % -44%
Avg. Sequential Read Speed
496 MB/s Slightly faster read speed.
454 MB/s -9%
Avg. Sequential Write Speed
389 MB/s Much faster write speed.
249 MB/s -56%
4K Read
Avg. 4K Random Read Speed
37.8 MB/s Much faster random read.
27.1 MB/s -39%
4K Write
Avg. 4K Random Write Speed
78 MB/s Much faster random write.
50.4 MB/s -55%
Avg. Sequential Mixed IO Speed
395 MB/s Much faster mixed IO speed.
241 MB/s -64%
4K Mixed
Avg. 4K Random Mixed IO Speed
32.9 MB/s Hugely faster random mixed IO.
14.6 MB/s -125%
Peak Sequential Read Speed
518 MB/s +4% 498 MB/s -4%
Peak Sequential Write Speed
417 MB/s Faster peak write speed.
339 MB/s -23%
4K Read
Peak 4K Random Read Speed
47.3 MB/s Faster peak random read.
37.5 MB/s -26%
4K Write
Peak 4K Random Write Speed
109 MB/s Much faster peak random write.
81.8 MB/s -33%
Peak Sequential Mixed IO Speed
423 MB/s Faster peak mixed IO speed.
326 MB/s -30%
4K Mixed
Peak 4K Random Mixed IO Speed
48.6 MB/s Hugely faster peak random mixed IO.
21.3 MB/s -128%
Market Share
Based on 4,776,024 SSDs tested.
Market Share
Market Share (trailing 30 days)
8.78 % Insanely higher market share.
0.46 % -1,809%
Value For Money
103 % Much better value.
75.8 % -35%
User Rating
UBM User Rating
126 % Hugely more popular.
63 % -100%
Price (score)
$85 -12% $75 Slightly cheaper.
36 Months Slightly more recent.
39 Months -8%
DQ Read
Peak 4K-64Thread Read Speed
379 MB/s +5% 362 MB/s -5%
DQ Write
Peak 4K-64Thread Write Speed
284 MB/s Much faster peak deep queue write.
208 MB/s -37%
AS-SSD Total
AS-SSD Total Score
1,170 Pts Stronger server IO.
1,008 Pts -16%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
122 MB/s Hugely faster peak deep queue mixed IO.
51.5 MB/s -137%
ADQ Read
Avg. 4K-64Thread Read Speed
196 MB/s Slightly faster deep queue read.
184 MB/s -7%
ADQ Write
Avg. 4K-64Thread Write Speed
183 MB/s Much faster deep queue write.
132 MB/s -39%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
64.4 MB/s Hugely faster deep queue mixed IO.
30.9 MB/s -108%
250GB 240GB

The 250GB Samsung 850 Evo has a similar architecture to its hugely successful predecessor, the 840 Evo. Both drives are TLC based but the 850 uses 3D V-NAND as opposed to regular NAND. Both drives also feature a Turbowrite cache (TWC) which buffers up to 3GB of writes. The TWC enables high burst write speeds but when the cache exhausts write speeds drop to 300 MB/s. Comparing the 850 and 840 Evos shows that effective speed, has improved by 11% and the warranty has been extended from three to five years but prices are also up by 11%. The 850 Evo does put in superb benchmarks (second only to the 850 Pro) but these are only valid within the TWC. At current price levels the 850 Evo struggles to compete with the value leaders[Dec '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) December 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 $280Nvidia GTX 1070 $410Samsung 850 Evo 250GB $85
AMD Ryzen 7 1700 $245AMD RX 480 $265Samsung 850 Pro 256GB $110
Intel Core i5-7600K $210Nvidia GTX 1060-6GB $260Samsung 850 Evo 500GB $140
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $205SanDisk Extreme 64GB $43
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $1,050SanDisk Extreme 32GB $22
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $215SanDisk Ultra Fit 32GB $10
Today's hottest deals
User Guide  •  About  •  FAQs  •  @Email  •  Privacy  •  Developer Feedback