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 1128 user samples
420 User Benchmarks:
Best Score: 103% 125GB free
Worst Score: 33% 169GB free
Worst: 33% Best: 103%
SPEED RANK: 32nd / 436
708 User Benchmarks:
Best Score: 99% 184GB free
Worst Score: 27% 187GB free
Worst: 27% Best: 99%
SPEED RANK: 55th / 436
Avg. Sequential Read Speed
496 MB/s +2% 488 MB/s -2%
Avg. Sequential Write Speed
406 MB/s +2% 400 MB/s -2%
4K Read?
Avg. 4K Random Read Speed
28.5 MB/s -22% 34.9 MB/s Faster random read.
4K Write?
Avg. 4K Random Write Speed
71.3 MB/s Slightly faster random write.
63.3 MB/s -13%
Avg. Sequential Mixed IO Speed
422 MB/s Faster mixed IO speed.
340 MB/s -24%
4K Mixed
Avg. 4K Random Mixed IO Speed
22 MB/s Slightly faster random mixed IO.
20.8 MB/s -6%
Peak Sequential Read Speed
525 MB/s +1% 521 MB/s -1%
Peak Sequential Write Speed
498 MB/s Slightly faster peak write speed.
442 MB/s -13%
4K Read?
Peak 4K Random Read Speed
36.4 MB/s -27% 46.1 MB/s Faster peak random read.
4K Write?
Peak 4K Random Write Speed
118 MB/s Slightly faster peak random write.
104 MB/s -13%
Peak Sequential Mixed IO Speed
508 MB/s Much faster peak mixed IO speed.
382 MB/s -33%
4K Mixed
Peak 4K Random Mixed IO Speed
28.4 MB/s +1% 28.1 MB/s -1%
Value For Money
90.5 % -15% 104 % Slightly better value.
User Rating?
UBM User Rating
78 % -14% 89 % Slightly more popular.
Price (score)
$170 -30% $119 Much cheaper.
Effective Speed?
Effective SSD Speed
485 MB/s +2% 477 MB/s -2%
22 Months -41% 13 Months Much more recent.
DQ Read?
Peak 4K-64Thread Read Speed
380 MB/s +1% 375 MB/s -1%
DQ Write?
Peak 4K-64Thread Write Speed
319 MB/s +5% 304 MB/s -5%
AS-SSD Total?
AS-SSD Total Score
1,207 Pts +2% 1,181 Pts -2%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
90.4 MB/s +2% 88.9 MB/s -2%
ADQ Read?
Avg. 4K-64Thread Read Speed
235 MB/s Slightly faster deep queue read.
211 MB/s -11%
ADQ Write?
Avg. 4K-64Thread Write Speed
210 MB/s Slightly faster deep queue write.
189 MB/s -11%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
60.6 MB/s Slightly faster deep queue mixed IO.
56.2 MB/s -8%
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 475 MB/s the EVO is however, within 5% 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 User Rankings Chart

August 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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The Best.
SanDisk Extreme USB 3.0 16GBSamsung 840 Evo 250GBIntel Core i7-4770KSeagate Barracuda 7200.14 3TBNvidia GTX 770
SanDisk Extreme USB 3.0 32GBSamsung 840 Evo 120GBIntel Core i5-3570KWD Black 1TB (2013)AMD R9 280X
Kingston DataTraveler 100 G3 USB 3.0 16GBSamsung 840 Pro 256GBAMD FX-9590WD Black 2TB (2013)AMD R9 280
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