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

Controller: Indilinx Barefoot 3 IDX500M00-BC. Flash: Toshiba 19nm (1st gen) MLC NAND.

Real World Speed
Performance profile from 1507 user samples
1353 User Benchmarks
Best Bench: 120% 237GB free
Worst Bench: 37% 1GB free
Worst: 37% Best: 120%
SPEED RANK: 47th / 601
154 User Benchmarks
Best Bench: 121% 139GB free
Worst Bench: 36% 145GB free
Worst: 36% Best: 121%
SPEED RANK: 26th / 601
Avg. Sequential Read Speed
492 MB/s +1% 489 MB/s -1%
Avg. Sequential Write Speed
391 MB/s -19% 466 MB/s Faster write speed.
4K Read
Avg. 4K Random Read Speed
28.6 MB/s Much faster random read.
21.7 MB/s -32%
4K Write
Avg. 4K Random Write Speed
71.9 MB/s -27% 91.5 MB/s Faster random write.
Avg. Sequential Mixed IO Speed
408 MB/s -15% 468 MB/s Slightly faster mixed IO speed.
4K Mixed
Avg. 4K Random Mixed IO Speed
21.6 MB/s -18% 25.4 MB/s Faster random mixed IO.
Peak Sequential Read Speed
525 MB/s +0% 523 MB/s -0%
Peak Sequential Write Speed
497 MB/s -2% 505 MB/s +2%
4K Read
Peak 4K Random Read Speed
36.4 MB/s Much faster peak random read.
27.1 MB/s -34%
4K Write
Peak 4K Random Write Speed
118 MB/s -26% 149 MB/s Faster peak random write.
Peak Sequential Mixed IO Speed
509 MB/s -0% 510 MB/s +0%
4K Mixed
Peak 4K Random Mixed IO Speed
28.3 MB/s -36% 38.5 MB/s Much faster peak random mixed IO.
Value For Money
52.5 % -35% 71.1 % Much better value.
User Rating
UBM User Rating
71 % Slightly more popular.
65 % -9%
Price (score)
$260 -34% $172 Much cheaper.
Effective Speed
Effective SSD Speed
90.3 % -6% 95.5 % Slightly faster effective speed.
29 Months -45% 16 Months Much more recent.
DQ Read
Peak 4K-64Thread Read Speed
378 MB/s +4% 364 MB/s -4%
DQ Write
Peak 4K-64Thread Write Speed
315 MB/s -12% 354 MB/s Slightly faster peak deep queue write.
AS-SSD Total
AS-SSD Total Score
1,200 Pts -3% 1,231 Pts +3%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
89.8 MB/s -11% 99.8 MB/s Slightly faster peak deep queue mixed IO.
ADQ Read
Avg. 4K-64Thread Read Speed
212 MB/s Slightly faster deep queue read.
194 MB/s -9%
ADQ Write
Avg. 4K-64Thread Write Speed
195 MB/s -17% 228 MB/s Faster deep queue write.
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
55.2 MB/s -5% 57.8 MB/s +5%
256GB 240GB

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]


Comparing the 150 to the original Vector is disappointing, the newer 150 actually offers marginally worse performance than its predecessor. A strange result but verified (at least partly) by figures on OCZ's own website: 100K 4K read IOPS for the Vector vs 90K 4K read IOPS for the 150. The newer 150 comes with a 5 year warranty which covers 50GB/day vs. the original Vectors 20GB/day but even this should be taken with a pinch of salt considering that the OCZ stock price is currently trading at around seven cents per share, an all time low. Despite the fact that new Vector 150 performs worse than its predecessor it's still a very competent performer and if prices drop, it has the potential to become a decent value proposition. In the meantime however there are far better deals available elsewhere.  [Dec '13 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
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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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