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

Controller: Samsung 3 Core MEX. Memory: Samsung 19nm Toggle Mode TLC.

Real World Speed
Performance profile from 268,789 user samples
214,431 User Benchmarks
Best Bench: 115% 113GB free
Worst Bench: 64% 181GB free
Poor: 64% Great: 115%
SPEED RANK: 74th / 873
54,358 User Benchmarks
Best Bench: 96% 32GB free
Worst Bench: 55% 73GB free
Poor: 55% Great: 96%
SPEED RANK: 215th / 873
Effective Speed
Effective SSD Speed
92.9 % Faster effective speed.
79.3 % -17%
Avg. Sequential Read Speed
495 MB/s +2% 485 MB/s -2%
Avg. Sequential Write Speed
390 MB/s Faster write speed.
316 MB/s -23%
4K Read
Avg. 4K Random Read Speed
37 MB/s +2% 36.2 MB/s -2%
4K Write
Avg. 4K Random Write Speed
76.4 MB/s Much faster random write.
58.3 MB/s -31%
Avg. Sequential Mixed IO Speed
396 MB/s Faster mixed IO speed.
325 MB/s -22%
4K Mixed
Avg. 4K Random Mixed IO Speed
32 MB/s Much faster random mixed IO.
20.5 MB/s -56%
Peak Sequential Read Speed
517 MB/s +1% 510 MB/s -1%
Peak Sequential Write Speed
417 MB/s Faster peak write speed.
352 MB/s -18%
4K Read
Peak 4K Random Read Speed
46.9 MB/s +2% 45.9 MB/s -2%
4K Write
Peak 4K Random Write Speed
108 MB/s Faster peak random write.
84.2 MB/s -28%
Peak Sequential Mixed IO Speed
422 MB/s Faster peak mixed IO speed.
357 MB/s -18%
4K Mixed
Peak 4K Random Mixed IO Speed
47.3 MB/s Much faster peak random mixed IO.
27.1 MB/s -75%
Market Share
Based on 4,725,021 SSDs tested.
Market Share
Market Share (trailing 30 days)
8.78 % Hugely higher market share.
1.6 % -449%
Value For Money
96.6 % Much better value.
54.1 % -79%
User Rating
UBM User Rating
126 % Hugely more popular.
68 % -85%
Price (score)
$90 Much cheaper.
$158 -43%
36 Months Much more recent.
53 Months -32%
DQ Read
Peak 4K-64Thread Read Speed
371 MB/s +1% 367 MB/s -1%
DQ Write
Peak 4K-64Thread Write Speed
283 MB/s Faster peak deep queue write.
241 MB/s -17%
AS-SSD Total
AS-SSD Total Score
1,156 Pts Slightly stronger server IO.
1,071 Pts -8%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
121 MB/s Much faster peak deep queue mixed IO.
83.8 MB/s -44%
ADQ Read
Avg. 4K-64Thread Read Speed
178 MB/s -8% 193 MB/s Slightly faster deep queue read.
ADQ Write
Avg. 4K-64Thread Write Speed
175 MB/s Slightly faster deep queue write.
154 MB/s -14%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
64.5 MB/s Much faster deep queue mixed IO.
48.3 MB/s -34%
250GB 250GB

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 Evo is remarkable in that, like the Sandisk Extreme II, it features a second level cache. For the 250 GB Evo this consists of a 3 GB Turbowrite cache (TWC) which is a block of high speed Flash Memory. When the TWC is exhausted write speeds drop by approximately 50% but that won't often happen under typical consumer workloads. In terms of raw performance, even with its cache, the Evo still isn't the fastest drive. With a real world speed index reading of 439 MB/s the EVO is however, within reach of the two speed leaders (Vector and 850 Pro). At a price point of $130 the Evo is around 30% cheaper making it the best value for money SSDs I have seen in 2014. Comparing the Evo and the Sandisk Ultra Plus shows that the Evo is the winner but the Sandisk may be a viable alternative thanks to its cache-free, and therefore more consistent performance during extended writes. [Aug '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

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Intel Core i7-7700K $313Nvidia GTX 1070 $410Samsung 850 Evo 250GB $90
AMD Ryzen 7 1700 $285AMD RX 480 $265Samsung 850 Evo 500GB $140
Intel Core i5-7600K $215Nvidia GTX 1060-6GB $260Samsung 850 Pro 256GB $114
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $200SanDisk Extreme 64GB $41
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
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