Average Bench: 89.5% (336th of 1071)

Based on 34,842 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 10.4% 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 126MB/s
Avg. 4K Random Read Speed 30.5MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 128GB is 48.5%. 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 268MB/s
Avg. Sustained Write Speed 286MB/s

Average Bench

(Based on 34,842 samples)
Min Avg Max
346 Read 444 497
132 Write 336 445
175 Mixed 268 331
87.3 SusWrite 286 440
74.6% 333 MB/s
Min Avg Max
20.9 4K Read 30.5 36.3
39.3 4K Write 81.6 113
23.9 4K Mixed 35.9 44.1
136% 49.3 MB/s
Min Avg Max
214 DQ Read 332 376
97.2 DQ Write 245 330
88.3 DQ Mixed 126 155
138% 234 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
115GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 363 361 359 358 356 360 MB/s
Read 486
Write 367
Mixed 299
SusWrite 360
85% 378 MB/s
4K Read 36.9
4K Write 119
4K Mixed 43
174% 66.2 MB/s
DQ Read 378
DQ Write 303
DQ Mixed 134
156% 272 MB/s
75GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 354 352 355 354 354 355 MB/s
Read 493
Write 362
Mixed 291
SusWrite 354
84% 375 MB/s
4K Read 32.8
4K Write 79.5
4K Mixed 38.2
141% 50.2 MB/s
DQ Read 378
DQ Write 304
DQ Mixed 131
155% 271 MB/s
21GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 230 152 143 136 134 125 MB/s
Read 475
Write 340
Mixed 268
SusWrite 153
69% 309 MB/s
4K Read 36.6
4K Write 115
4K Mixed 41.9
170% 64.5 MB/s
DQ Read 364
DQ Write 286
DQ Mixed 132
151% 261 MB/s
57GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 95 94 98 98 84 100 MB/s
Read 298
Write 195
Mixed 188
SusWrite 94.9
43% 194 MB/s
4K Read 24.5
4K Write 43.4
4K Mixed 28.8
97% 32.2 MB/s
DQ Read 33.9
DQ Write 87.6
DQ Mixed 42.1
37% 54.5 MB/s
34,842 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 65,445,621 SSDs tested.


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MSRP ≈ $131 @ launch in Oct '12
EbayUS $7012 mins
AmazonUS $1605 years
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Typical 840 Pro 128GB Builds (Compare 3,034 builds) See popular component choices, score breakdowns and rankings.
Gaming 37%
Jet ski
Desktop 77%
Workstation 29%

Motherboard: Asrock Z77 Extreme4 - $167

EDIT WITH CUSTOM PC BUILDER Value: 43% - Average Total price: $731

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.
  • - SkillBench (space shooter) tests user input accuracy.
  • - 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.
Solid State Drive Rankings (Price vs Performance) March 2023 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.

Above average

9 years ago.

1071 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 i5-13600K $315Nvidia RTX 3060-Ti $420Crucial MX500 250GB $31
Intel Core i5-12600K $194Nvidia RTX 3060 $365Samsung 850 Evo 120GB $106
Intel Core i5-12400F $155Nvidia RTX 4070-Ti $830Samsung 860 Evo 250GB $50
Seagate Barracuda 1TB (2016) $34Corsair Vengeance LPX DDR4 3200 C16 2x8GB $43SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $30Corsair Vengeance LPX DDR4 3000 C15 2x8GB $43SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $381SanDisk Ultra Fit 32GB $16
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