Average Bench: 87.3% (305th of 1011)

Based on 23,003 user benchmarks.  Models: Samsung SSD 840 PRO Series, Samsung SSD 840, Samsung SSD 840 PRO Seri, Samsung SSD 840 PRO

The 128GB 840 Pro is a rock solid performer. On release, nearly a year and a half ago, the Pro smashed several speed records. Today, with sequential read/write speeds of 519/438 MBps, the Pro is still one of the fastest SSDs available. One of the Pro's top competitors is Samsungs own, newer 840 Evo. Looking at a raw synthetic speed comparison of the 128GB Pro and Evo is a little misleading. On the face of it the Pro only has a marginal lead over the Evo. This due to the fact that the Evo can only maintain its burst write speed for transfers of up to 3GB, the size of its SLC cache. The Pro on the other hand can sustain higher throughputs indefinitely. The Pro also utilizes MLC which is rated for far more erase cycles than the TLC used in the Evo. Server IO is often continuous and would quickly exhaust the 3GB cache on the Evo but for typical consumer use the Evo will remain within the SLC cache most of the time. [Feb '14 SSDrivePro]


Very good average bench

The Samsung 840 Pro 128GB averaged just 12.7% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Samsung 840 Pro 128GB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 117MB/s
Avg. 4K Random Read Speed 30.4MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 128GB is 52.6%. This is a relatively wide range which indicates that the Samsung 840 Pro 128GB performs inconsistently under varying real world conditions.


Avg. Sequential Mixed IO Speed 260MB/s
Avg. Sustained Write Speed 270MB/s

Average Bench

(Based on 23,003 samples)
Min Avg Max
336 Read 441 494
119 Write 320 444
166 Mixed 260 329
77 SusWrite 270 440
72.2% 323 MB/s
Min Avg Max
22.3 4K Read 30.4 36.4
44.9 4K Write 81.5 115
25.2 4K Mixed 35.4 43.8
134% 49.1 MB/s
Min Avg Max
33.2 DQ Read 307 377
91.7 DQ Write 232 326
40 DQ Mixed 117 155
129% 219 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
68GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 375 317 426 429 432 433 MB/s
Read 474
Write 441
Mixed 306
SusWrite 402
91% 406 MB/s
4K Read 31.6
4K Write 81.9
4K Mixed 39.9
142% 51.1 MB/s
DQ Read 370
DQ Write 334
DQ Mixed 153
169% 286 MB/s
28GB free (System drive)
Firmware: DXM04B0Q
SusWrite @10s intervals: 163 129 121 118 113 113 MB/s
Read 476
Write 306
Mixed 232
SusWrite 126
63% 285 MB/s
4K Read 35.2
4K Write 89.1
4K Mixed 37.8
149% 54 MB/s
DQ Read 372
DQ Write 238
DQ Mixed 116
137% 242 MB/s
35GB free
Firmware: DXM05B0Q
SusWrite @10s intervals: 169 195 197 200 200 201 MB/s
Read 374
Write 374
Mixed 289
SusWrite 194
69% 308 MB/s
4K Read 33.2
4K Write 83
4K Mixed 40.8
146% 52.3 MB/s
DQ Read 234
DQ Write 197
DQ Mixed 127
120% 186 MB/s
47GB free (System drive)
Firmware: DXM04B0Q
SusWrite @10s intervals: 219 141 138 144 143 149 MB/s
Read 462
Write 331
Mixed 246
SusWrite 156
66% 299 MB/s
4K Read 26.6
4K Write 84.2
4K Mixed 29.7
123% 46.8 MB/s
DQ Read 375
DQ Write 289
DQ Mixed 111
143% 258 MB/s
23,003 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 18,505,703 SSDs tested.


Approx. $131 @ launch in Oct '12
AmazonUS $1602 years
OutletPCUS $1982 years
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Typical 840 Pro 128GB Builds (Compare 15,601 builds) See popular component choices, score breakdowns and rankings.
Gaming 47%
Desktop 63%
Workstation 34%
Sail boat

Motherboard: Asrock Z77 Extreme4 - $167

EDIT WITH CUSTOM PC BUILDER Value: 34% - Below average Total price: $905

Popular 840 Pro 128GB 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.

UserBenchmark of the month

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.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the current market leaders.
  • - Explore your best upgrade options with a virtual PC build.
  • - Compare your in-game FPS to other users with your hardware.
  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) October 2019 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 5 years ago.

Above average

5 years ago.

1011 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

 Best User Rated

The Best.
Intel Core i5-9400F $145Nvidia GTX 1660 $210Samsung 850 Evo 250GB $73
Intel Core i5-9600K $240Nvidia GTX 1660-Ti $270Samsung 850 Evo 500GB $107
Intel Core i7-9700K $350Nvidia RTX 2060 $349Samsung 850 Pro 256GB $200
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $65SanDisk Extreme 64GB $88
Seagate Barracuda 3TB (2016) $78G.SKILL Trident Z DDR4 3200 C14 4x16GB $612SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $37Corsair Vengeance LPX DDR4 3200 C16 2x8GB $70SanDisk Ultra Fit 32GB $14
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