Average Bench: 94.4% (269th of 1058)

Based on 69,291 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]

Excellent average bench

The Samsung 840 Pro 256GB averaged just 5.6% 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-64Thread Mixed IO Speed 142MB/s
Avg. 4K Random Mixed IO Speed 38.6MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 51.5%. This is a relatively wide range which indicates that the Samsung 840 Pro 256GB performs inconsistently under varying real world conditions.


Avg. Sequential Mixed IO Speed 304MB/s
Avg. Sustained Write Speed 328MB/s

Average Bench

(Based on 69,291 samples)
Min Avg Max
345 Read 459 509
134 Write 379 482
220 Mixed 304 363
90.6 SusWrite 328 479
82.5% 368 MB/s
Min Avg Max
19.7 4K Read 30.3 36.2
40.3 4K Write 81.8 114
26.2 4K Mixed 38.6 47.6
139% 50.2 MB/s
Min Avg Max
196 DQ Read 334 385
117 DQ Write 258 334
91.5 DQ Mixed 142 176
148% 245 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
79GB free
Firmware: DXM05B0Q
SusWrite @10s intervals: 488 488 488 488 488 489 MB/s
Read 507
Write 479
Mixed 344
SusWrite 488
102% 454 MB/s
4K Read 36.3
4K Write 113
4K Mixed 46.3
174% 65.3 MB/s
DQ Read 369
DQ Write 315
DQ Mixed 157
168% 280 MB/s
93GB free (System drive)
Firmware: DXM06B0Q
SusWrite @10s intervals: 447 465 452 235 209 208 MB/s
Read 503
Write 476
Mixed 331
SusWrite 336
92% 412 MB/s
4K Read 35.1
4K Write 101
4K Mixed 43.3
162% 59.8 MB/s
DQ Read 353
DQ Write 229
DQ Mixed 141
146% 241 MB/s
102GB free (System drive)
Firmware: DXM06B0Q
SusWrite @10s intervals: 274 228 221 219 212 216 MB/s
Read 509
Write 470
Mixed 322
SusWrite 228
86% 382 MB/s
4K Read 35.2
4K Write 103
4K Mixed 46.4
167% 61.6 MB/s
DQ Read 380
DQ Write 307
DQ Mixed 166
173% 284 MB/s
56GB free (System drive)
Firmware: DXM0
SusWrite @10s intervals: 401 408 390 330 413 411 MB/s
Read 427
Write 233
Mixed 324
SusWrite 392
77% 344 MB/s
4K Read 18.4
4K Write 38.2
4K Mixed 23.9
79% 26.8 MB/s
DQ Read 308
DQ Write 258
DQ Mixed 159
153% 242 MB/s
69,291 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 51,464,904 SSDs tested.


MSRP ≈ $203 @ launch in Oct '12
EbayUS $1991 min
AmazonUS $27120 months
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Typical 840 Pro 256GB Builds (Compare 4,806 builds) See popular component choices, score breakdowns and rankings.
Gaming 64%
Desktop 83%
Aircraft carrier
Workstation 54%

Motherboard: Asus MAXIMUS VI HERO - $190

EDIT WITH CUSTOM PC BUILDER Value: 68% - Good Total price: $807

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.
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - SkillBench (space shooter) tests user input accuracy.
  • - Reports are generated and presented on userbenchmark.com.
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Solid State Drive Rankings (Price vs Performance) January 2022 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 - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.


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

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

Added 9 years ago.

Good (edit your comment) Add link

22 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


2 years ago.

Owning it for almost 6 Years, still running very fast


3 years ago.

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


4 years ago.

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


3 years ago.

Need to improve a lot on Research and Development . Please don't fool people with your small small improvements .With R&D U can do much better.


4 years ago.


6 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?


20 months ago.


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

Very good

8 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/...

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


5 years ago.


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

Very good

9 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.


7 years ago.

Just the best 256G SSD for me!

1058 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.

 Frequently Asked Questions

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Intel Core i5-12400F $184Nvidia RTX 3070 $500Samsung 860 Evo 250GB $52
Intel Core i5-11600K $250Nvidia RTX 3080 $700Samsung 850 Evo 120GB $200
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WD Blue 1TB (2012) $39Corsair Vengeance LPX DDR4 3000 C15 2x8GB $75SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $71G.SKILL Trident Z DDR4 3200 C14 4x16GB $470SanDisk Ultra Fit 32GB $16
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