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

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

Real World Speed
Performance profile from 1266 user samples
472 User Benchmarks:
Best Score: 118% 125GB free
Worst Score: 20% 186GB free
Worst: 20% Best: 118%
SPEED RANK: 55th / 452
794 User Benchmarks:
Best Score: 131% 40GB free
Worst Score: 17% 164GB free
Worst: 17% Best: 131%
SPEED RANK: 31st / 452
Avg. Sequential Read Speed
448 MB/s +4% 430 MB/s -4%
Avg. Sequential Write Speed
367 MB/s -10% 402 MB/s Slightly faster write speed.
4K Read?
Avg. 4K Random Read Speed
27.3 MB/s -21% 33 MB/s Faster random read.
4K Write?
Avg. 4K Random Write Speed
66 MB/s +1% 65.1 MB/s -1%
Avg. Sequential Mixed IO Speed
381 MB/s -5% 399 MB/s +5%
4K Mixed
Avg. 4K Random Mixed IO Speed
21.4 MB/s -25% 26.7 MB/s Faster random mixed IO.
Peak Sequential Read Speed
524 MB/s +1% 519 MB/s -1%
Peak Sequential Write Speed
497 MB/s -1% 502 MB/s +1%
4K Read?
Peak 4K Random Read Speed
35.9 MB/s -26% 45.2 MB/s Faster peak random read.
4K Write?
Peak 4K Random Write Speed
113 MB/s 0% 113 MB/s 0%
Peak Sequential Mixed IO Speed
508 MB/s 0% 508 MB/s 0%
4K Mixed
Peak 4K Random Mixed IO Speed
28.1 MB/s -30% 36.5 MB/s Faster peak random mixed IO.
Value For Money
82.6 % -21% 100 % Better value.
User Rating?
UBM User Rating
79 % -13% 89 % Slightly more popular.
Price (score)
$195 -28% $140 Cheaper.
Effective Speed?
Effective SSD Speed
559 MB/s -5% 589 MB/s Slightly faster effective speed.
21 Months -43% 12 Months Much more recent.
DQ Read?
Peak 4K-64Thread Read Speed
380 MB/s +2% 373 MB/s -2%
DQ Write?
Peak 4K-64Thread Write Speed
317 MB/s -8% 343 MB/s Slightly faster peak deep queue write.
AS-SSD Total?
AS-SSD Total Score
1,199 Pts -3% 1,233 Pts +3%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
90 MB/s -30% 117 MB/s Much faster peak deep queue mixed IO.
ADQ Read?
Avg. 4K-64Thread Read Speed
215 MB/s Faster deep queue read.
186 MB/s -16%
ADQ Write?
Avg. 4K-64Thread Write Speed
194 MB/s +2% 191 MB/s -2%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
58.4 MB/s -19% 69.7 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 Evo is remarkable in that, like the Sandisk Extreme II, it features a second level cache. For the 250 GB Evo this comprises 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 551 MB/s the EVO is however, within 5% of the two speed leaders (Vector and 840 Pro). At a price point of £100 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 clear winner but the Sandisk may be a viable alternative thanks to its cache-free, and therefore more consistent performance during extended writes. [Aug '13 SSDrivePro]


Solid State Drive User Rankings Chart

July 2014 SSD Rankings

Welcome to our consumer SSD comparison. We calculate effective speed which measures performance for typical consumers. Effective speed is adjusted 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. Vote to share your opinion. [SSDrivePro]

Group Test Results

How Fast Is Your SSD?

Size up your PC in less than a minute.

Welcome to our free PC speed test tool. UserBenchMark will compare the strengths and weaknesses of each component in your PC to the ten most popular components in its class.

How it works

  • - Download and run UserBenchMark (UBM)
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - Drive benchmarks include: read, write and mixed IO.
  • - CPU benchmarks include: integer, floating and string.
  • - GPU benchmarks include: DX9 and DX10 3D performance.
  • - 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
  • - Share your opinion by voting

Frequently Asked Questions


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Best User Rated
SanDisk Extreme USB 3.0 16GBSamsung 840 Evo 250GBIntel Core i7-4770KSeagate Barracuda 7200.14 1TBAMD R9 280X
SanDisk Extreme USB 3.0 32GBSamsung 840 Pro 256GBIntel Core i5-3570KWD Blue 1TB (2012)AMD R9 270X
Lexar JumpDrive P10 USB 3.0 32GBSamsung 840 Evo 120GBIntel Core i5-4670KSeagate Barracuda 7200.14 3TBNvidia GTX 770
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