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 562 user samples
Worst: 20% Best: 118%
SPEED RANK: 56th / 697
Worst: 9% Best: 131%
SPEED RANK: 39th / 697
Avg. Sequential Read Speed
446 MB/s Slightly faster read speed.
424 MB/s -5%
Avg. Sequential Write Speed
368 MB/s -7% 394 MB/s Slightly faster write speed.
4K Read?
Avg. 4K Random Read Speed
27.5 MB/s -18% 32.5 MB/s Faster random read.
4K Write?
Avg. 4K Random Write Speed
65.8 MB/s +4% 63 MB/s -4%
Avg. Sequential Mixed IO Speed
381 MB/s -2% 388 MB/s +2%
4K Mixed
Avg. 4K Random Mixed IO Speed
21.7 MB/s -22% 26.5 MB/s Faster random mixed IO.
Peak Sequential Read Speed
524 MB/s Slightly faster peak read speed.
477 MB/s -10%
Peak Sequential Write Speed
505 MB/s +2% 494 MB/s -2%
4K Read?
Peak 4K Random Read Speed
38 MB/s -8% 41 MB/s Slightly faster peak random read.
4K Write?
Peak 4K Random Write Speed
124 MB/s +4% 119 MB/s -4%
Peak Sequential Mixed IO Speed
507 MB/s -0% 508 MB/s +0%
4K Mixed
Peak 4K Random Mixed IO Speed
27.8 MB/s -32% 36.6 MB/s Much faster peak random mixed IO.
Value For Money
83 % -21% 100 % Better value.
User Rating?
UBM User Rating
85 % -7% 91 % Slightly more popular.
Price (score)
158 GBP -23% 122 GBP Cheaper.
Effective Speed?
Effective SSD Speed
579 MB/s +5% 551 MB/s -5%
18 Months -50% 9 Months Much more recent.
DQ Read?
Peak 4K-64Thread Read Speed
384 MB/s Slightly faster peak deep queue read.
355 MB/s -8%
DQ Write?
Peak 4K-64Thread Write Speed
326 MB/s Much faster peak deep queue write.
224 MB/s -46%
AS-SSD Read?
AS-SSD Read Score
475 Pts Slightly stronger server read.
444 Pts -7%
AS-SSD Write?
AS-SSD Write Score
501 Pts Stronger server write.
394 Pts -27%
AS-SSD Total?
AS-SSD Total Score
1,232 Pts Slightly stronger server IO.
1,081 Pts -14%
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
226 MB/s Faster deep queue read.
190 MB/s -19%
ADQ Write?
Avg. 4K-64Thread Write Speed
201 MB/s Slightly faster deep queue write.
190 MB/s -6%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
59.3 MB/s -17% 69.2 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 £140 the Evo is around 20% cheaper making it one of the best value for money SSDs I have seen in 2013. It's a tough call between the Evo and the Sandisk Ultra Plus, the Evo is the overall winner but I might be tempted to go for the Sandisk because of its cache-free, and therefore more consistent performance for some use-cases. [Aug '13 SSDrivePro]


Solid State Drive User Rankings Chart

April 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

Best User Rated SSDs

Share with friends on Facebook Share with followers on Twitter Share with followers on Google+