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

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

Real World Speed
Performance profile from 313,243 user samples
276,110 User Benchmarks
Best Bench: 115% 64GB free
Worst Bench: 71% 106GB free
Poor: 71% Great: 115%
SPEED RANK: 86th / 911
37,133 User Benchmarks
Best Bench: 121% 182GB free
Worst Bench: 71% 141GB free
Poor: 71% Great: 121%
SPEED RANK: 80th / 911
Effective Speed
Effective SSD Speed
94.9 % 98.3 % +4%
Avg. Sequential Read Speed
498 MB/s 502 MB/s +1%
Avg. Sequential Write Speed
396 MB/s 441 MB/s Slightly faster write speed.
4K Read
Avg. 4K Random Read Speed
38.2 MB/s Faster random read.
32.6 MB/s
4K Write
Avg. 4K Random Write Speed
76.8 MB/s 85.9 MB/s Slightly faster random write.
Avg. Sequential Mixed IO Speed
401 MB/s 460 MB/s Slightly faster mixed IO speed.
4K Mixed
Avg. 4K Random Mixed IO Speed
33.5 MB/s 34.4 MB/s +3%
Peak Sequential Read Speed
517 MB/s 528 MB/s +2%
Peak Sequential Write Speed
417 MB/s 502 MB/s Faster peak write speed.
4K Read
Peak 4K Random Read Speed
46.6 MB/s Slightly faster peak random read.
42.1 MB/s
4K Write
Peak 4K Random Write Speed
103 MB/s 121 MB/s Faster peak random write.
Peak Sequential Mixed IO Speed
422 MB/s 513 MB/s Faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
47.9 MB/s 50.8 MB/s Slightly faster peak random mixed IO.
Market Share
Based on 6,060,410 SSDs tested.
Market Share
Market Share (trailing 30 days)
6.86 % Hugely higher market share.
0.75 %
Value For Money
103 % Much better value.
75.2 %
User Rating
UBM User Rating
125 % More popular.
99 %
Price (score)
$85 Much cheaper.
39 Months Slightly more recent.
44 Months
DQ Read
Peak 4K-64Thread Read Speed
372 MB/s 375 MB/s +1%
DQ Write
Peak 4K-64Thread Write Speed
280 MB/s 336 MB/s Faster peak deep queue write.
AS-SSD Total
AS-SSD Total Score
1,148 Pts 1,232 Pts Slightly stronger server IO.
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
122 MB/s 163 MB/s Much faster peak deep queue mixed IO.
ADQ Read
Avg. 4K-64Thread Read Speed
186 MB/s 196 MB/s Slightly faster deep queue read.
ADQ Write
Avg. 4K-64Thread Write Speed
176 MB/s 211 MB/s Faster deep queue write.
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
66.8 MB/s 88 MB/s Much faster deep queue mixed IO.
250GB 256GB

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 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

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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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