Controller: Samsung 3-core MDX. Flash Memory: Samsung 21nm Toggle Mode MLC.

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

Real World Speed
Performance profile from 296,946 user samples
20,836 User Benchmarks
Best Bench: 107% 207GB free
Worst Bench: 58% 92GB free
Poor: 58% Great: 107%
SPEED RANK: 159th / 911
276,110 User Benchmarks
Best Bench: 115% 64GB free
Worst Bench: 71% 106GB free
Poor: 71% Great: 115%
SPEED RANK: 86th / 911
Effective Speed
Effective SSD Speed
84.6 % 94.9 % Slightly faster effective speed.
Avg. Sequential Read Speed
494 MB/s 498 MB/s +1%
Avg. Sequential Write Speed
366 MB/s 396 MB/s Slightly faster write speed.
4K Read
Avg. 4K Random Read Speed
28.9 MB/s 38.2 MB/s Much faster random read.
4K Write
Avg. 4K Random Write Speed
78.8 MB/s +3% 76.8 MB/s
Avg. Sequential Mixed IO Speed
398 MB/s 401 MB/s +1%
4K Mixed
Avg. 4K Random Mixed IO Speed
22.4 MB/s 33.5 MB/s Much faster random mixed IO.
Peak Sequential Read Speed
523 MB/s +1% 517 MB/s
Peak Sequential Write Speed
496 MB/s Faster peak write speed.
417 MB/s
4K Read
Peak 4K Random Read Speed
36.1 MB/s 46.6 MB/s Faster peak random read.
4K Write
Peak 4K Random Write Speed
112 MB/s Slightly faster peak random write.
103 MB/s
Peak Sequential Mixed IO Speed
509 MB/s Faster peak mixed IO speed.
422 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed
28.9 MB/s 47.9 MB/s Much faster peak random mixed IO.
Market Share
Based on 6,060,410 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.34 % 6.86 % Insanely higher market share.
Value For Money
37.2 % 103 % Hugely better value.
User Rating
UBM User Rating
63 % 125 % Hugely more popular.
Price (score)
$290 $85 Much cheaper.
65 Months 39 Months Much more recent.
DQ Read
Peak 4K-64Thread Read Speed
368 MB/s 372 MB/s +1%
DQ Write
Peak 4K-64Thread Write Speed
322 MB/s Faster peak deep queue write.
280 MB/s
AS-SSD Total
AS-SSD Total Score
1,185 Pts +3% 1,148 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
90.4 MB/s 122 MB/s Much faster peak deep queue mixed IO.
ADQ Read
Avg. 4K-64Thread Read Speed
195 MB/s +5% 186 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed
194 MB/s Slightly faster deep queue write.
176 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
53 MB/s 66.8 MB/s Faster deep queue mixed IO.
256GB 250GB

The 840 Pro is stunning. Samsung have created a completely in-house package including both the controller and their own new 21nm toggle mode NAND. On release (Oct '12) this was the fastest performing deep queue depth consumer grade SSD available. Fast forward six months (Apr '13) and the 840 Pro still holds both the random read/write deep queue depth speed records of 384 MB/s and 326 MB/s, impressive considering how fast the SSD space tends to move. There are no obvious weaknesses, in-fact the 840 pro takes first place in nearly all of the speed categories and is only seriously rivalled by one drive, the OCZ Vector. To conclude, in terms of both outright performance, particularly server orientated, and value for money the 256GB and 128GB 840 Pros are amongst the top handful of drives currently available. [Jun '13 SSDrivePro]


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]


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
Today's hottest deals
User Guide  •  About  •  FAQs  •  @Email  •  Privacy  •  Developer Feedback