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 4645 user samples
1366 User Benchmarks
Best Bench: 120% 237GB free
Worst Bench: 37% 1GB free
Worst: 37% Best: 120%
SPEED RANK: 50th / 606
3279 User Benchmarks
Best Bench: 114% 160GB free
Worst Bench: 28% 61GB free
Worst: 28% Best: 114%
SPEED RANK: 86th / 606
Avg. Sequential Read Speed
492 MB/s +3% 479 MB/s -3%
Avg. Sequential Write Speed
390 MB/s Slightly faster write speed.
340 MB/s -15%
4K Read
Avg. 4K Random Read Speed
28.6 MB/s -23% 35.1 MB/s Faster random read.
4K Write
Avg. 4K Random Write Speed
71.8 MB/s Faster random write.
57.2 MB/s -26%
Avg. Sequential Mixed IO Speed
408 MB/s Faster mixed IO speed.
315 MB/s -30%
4K Mixed
Avg. 4K Random Mixed IO Speed
21.6 MB/s Slightly faster random mixed IO.
19.5 MB/s -11%
Peak Sequential Read Speed
525 MB/s +3% 511 MB/s -3%
Peak Sequential Write Speed
497 MB/s Much faster peak write speed.
377 MB/s -32%
4K Read
Peak 4K Random Read Speed
36.4 MB/s -25% 45.6 MB/s Faster peak random read.
4K Write
Peak 4K Random Write Speed
118 MB/s Much faster peak random write.
90.7 MB/s -30%
Peak Sequential Mixed IO Speed
509 MB/s Much faster peak mixed IO speed.
356 MB/s -43%
4K Mixed
Peak 4K Random Mixed IO Speed
28.3 MB/s Slightly faster peak random mixed IO.
26.8 MB/s -6%
Value For Money
52.8 % -50% 79.5 % Much better value.
User Rating
UBM User Rating
69 % -3% 71 % +3%
Price (score)
$257 -48% $134 Much cheaper.
Effective Speed
Effective SSD Speed
90.2 % Slightly faster effective speed.
85.3 % -6%
29 Months -31% 20 Months Much more recent.
DQ Read
Peak 4K-64Thread Read Speed
378 MB/s +3% 368 MB/s -3%
DQ Write
Peak 4K-64Thread Write Speed
315 MB/s Faster peak deep queue write.
259 MB/s -22%
AS-SSD Total
AS-SSD Total Score
1,200 Pts Slightly stronger server IO.
1,101 Pts -9%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
89.8 MB/s Slightly faster peak deep queue mixed IO.
83.2 MB/s -8%
ADQ Read
Avg. 4K-64Thread Read Speed
212 MB/s Slightly faster deep queue read.
189 MB/s -12%
ADQ Write
Avg. 4K-64Thread Write Speed
195 MB/s Faster deep queue write.
157 MB/s -24%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
55.2 MB/s Faster deep queue mixed IO.
48 MB/s -15%
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 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]


How Fast Is Your SSD? (Bench your build) 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
Custom PC Builder (Start a new build) Compare component prices, popularity, speed and value for money.

PC Builder will help you build your perfect PC by clearly presenting relevant performance statistics together with price, compatibility and popularity data.

Frequently Asked Questions


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