Average Bench: 84.2% (166th of 908)

Based on 21,295 user benchmarks.  Models: Samsung SSD 840 PRO Series, Samsung SSD 840, Samsung SSD 840 PRO Seri, Samsung SSD 840 PRO

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]


Very good average bench

The Samsung 840 Pro 256GB averaged just 15.8% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Samsung 840 Pro 256GB near the top of the comparison list.


Avg. 4K Random Read Speed 28.8MB/s
Avg. 4K Random Write Speed 78.5MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 51.4%. This is a relatively wide range which indicates that the Samsung 840 Pro 256GB performs inconsistently under varying real world conditions.


Avg. 4K-64Thread Read Speed 196MB/s
Avg. 4K-64Thread Mixed IO Speed 53.3MB/s

Average Bench

(Based on 21,295 samples)
Min Avg Max
371 Read 493 523
104 Write 363 495
156 Mixed 396 509
92.7% 417 MB/s
Min Avg Max
20 4K Read 28.8 36.1
39.5 4K Write 78.5 113
14.7 4K Mixed 22.3 29
114% 43.2 MB/s
Min Avg Max
25.6 DQ Read 196 369
68.5 DQ Write 194 322
15.4 DQ Mixed 53.3 90.5
79% 148 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
67GB free
Firmware: DXM04B0Q Max speed: SATA 3.0 600 MB/s
Read 501
Write 191
Mixed 254
69% 315 MB/s
4K Read 31.7
4K Write 79.2
4K Mixed 20.7
117% 43.9 MB/s
DQ Read 32.3
DQ Write 83.6
DQ Mixed 19.9
26% 45.3 MB/s
30GB free
Firmware: DXM06B0Q Max speed: SATA 3.0 600 MB/s
Read 469
Write 101
Mixed 170
53% 247 MB/s
4K Read 32.7
4K Write 106
4K Mixed 23.6
136% 54.2 MB/s
DQ Read 34.7
DQ Write 121
DQ Mixed 18.9
32% 58.2 MB/s
21,295 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 6,017,347 SSDs tested.


Approx. $203 @ launch in Oct '12
EbayUS $2901 min
OutletPCUS $30514 days
AmazonUS $33012 mins
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Typical 840 Pro 256GB Builds (Compare 3,688 builds) See popular component choices, score breakdowns and rankings.
Gaming 61%
Desktop 71%
Workstation 53%

Motherboard: Asus MAXIMUS VI HERO - $180

EDIT WITH CUSTOM PC BUILDER Value: 57% - Above average Total price: $1,308

Popular 840 Pro 256GB compatible motherboards:

How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

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How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
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Solid State Drive Rankings (Price vs Performance) March 2018 SSD Rankings.

Welcome to our 2.5" and M.2 SSD comparison. We calculate effective speed for both SATA and NVMe drives based on real world performance then adjust by current prices per GB to yield a value for money rating. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top SSDs. [SSDrivePro]

Group Test Results

  • Best user rated - Sometimes benchmarks get it completely wrong...
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
  • Best value for money - Value for money is based on real world performance, price and capacity.
  • Raw speed comparison - Raw speed readings.
  • Details ordered by value - Detailed performance stats ordered by overall value for money.


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

Delivers high speeds for both compressible and incompressible data...

Added 5 years ago.

Good (edit your comment) Add link

9 months ago.

Got it a year or so ago and I loved it then and still love it now, though it is a little pricy


T61P with win7 64 &, Intel Extreme X9000, 8gb ram, fast ......... verrrry fast. Faster than many new computers. Gives a lot of new life to older PCs.—Sep '14


11 months ago.

Very good.


9 months ago.

An awesome drive! Going to get one to upgrade my rig!


11 months ago.

Excellent performance and reliability. I already have 5TB traffic over the past year. Performance has not decreased!


9 months ago.


15 months ago.

one Best product for the Good Price


16 months ago.

It's perfect!

Very good

4 years ago.

Review  hexus.net/...

Image  img.hexus.net/...
Sep '12 AS SSD Benchmark Test

Sep '12 AS SSD Benchmark Test

Review  www.hardocp.com/...

Image  www.hardocp.com/...
Dec '12 AS SSD Benchmark Test Score

Dec '12 AS SSD Benchmark Test Score

Review  www.servethehome.com/...

Image  www.servethehome.com/...
Nov '12 AS SSD Benchmark Test Score

Nov '12 AS SSD Benchmark Test Score

Review  www.custompcreview.com/...

Image  www.custompcreview.com/...
Sep '12 AS SSD Benchmark Speed Test Score

Sep '12 AS SSD Benchmark Speed Test Score

Deal  www.google.co.uk/...

Jun '13 £185 @Ebuyer


13 months ago.


though for any practical purpose the EVO is just as good/fast—Sep '14


9 months ago.

Amazing. Just that.


2 years ago.

Can someone please explain to me why I get under 1MB/s 4K Mixed IO with my Samsung 840 pro when the average UBM Speed is 21.8MB/s for 4K Mixed IO operations?


2 years ago.


Great drive under normal/light load. Write latency starts to fall apart a bit under sustained loads.—Sep '14

Very good

5 years ago.

This drive, the latest from Samsung, takes SSD technology a small but clear step forward. It excels in the area of deep queue depth 4k random writes where it outperforms all of its direct competition. The brand new and almost impossible to get hold of Plextor M5 is currently the strongest competitor to the Samsung but until prices on the Plextor drop from an astronomical £250, Samsung have an easy win despite not having priced the 840 particularly aggressively themselves.


3 years ago.

Just the best 256G SSD for me!

908 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different SSDs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

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