Average Bench: 87.5% (288th of 1003)

Based on 19,465 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 12.4% 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 120MB/s
Avg. 4K Random Mixed IO Speed 35.7MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 128GB is 47.8%. 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 258MB/s
Avg. Sustained Write Speed 263MB/s

Average Bench

(Based on 19,465 samples)
Min Avg Max
340 Read 440 495
134 Write 321 443
165 Mixed 258 326
88 SusWrite 263 429
71.6% 321 MB/s
Min Avg Max
21.8 4K Read 30.2 36.4
46.9 4K Write 83.9 119
26.2 4K Mixed 35.7 44.2
136% 49.9 MB/s
Min Avg Max
36.8 DQ Read 322 376
94.4 DQ Write 233 323
39.9 DQ Mixed 120 154
132% 225 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
14GB free
Firmware: DXM04B0Q
SusWrite @10s intervals: 374 371 359 294 333 316 MB/s
Read 497
Write 200
Mixed 298
SusWrite 341
74% 334 MB/s
4K Read 34.7
4K Write 89.9
4K Mixed 40.6
152% 55.1 MB/s
DQ Read 216
DQ Write 188
DQ Mixed 107
106% 170 MB/s
29GB free (System drive)
Firmware: DXM06B0Q
SusWrite @10s intervals: 300 287 295 238 184 131 MB/s
Read 471
Write 365
Mixed 279
SusWrite 239
76% 339 MB/s
4K Read 34.5
4K Write 93
4K Mixed 39.7
152% 55.7 MB/s
DQ Read 223
DQ Write 188
DQ Mixed 107
107% 173 MB/s
119GB free
Firmware: DXM04B0Q
SusWrite @10s intervals: 100 148 148 149 150 148 MB/s
Read 372
Write 329
Mixed 245
SusWrite 140
61% 272 MB/s
4K Read 28.1
4K Write 63.5
4K Mixed 32.7
118% 41.4 MB/s
DQ Read 30.1
DQ Write 79.1
DQ Mixed 37.2
33% 48.8 MB/s
34GB free (System drive)
Firmware: DXM04B0Q
SusWrite @10s intervals: 125 118 118 118 120 118 MB/s
Read 339
Write 130
Mixed 148
SusWrite 119
41% 184 MB/s
4K Read 22.6
4K Write 31.4
4K Mixed 23.6
81% 25.9 MB/s
DQ Read 24.5
DQ Write 34.9
DQ Mixed 24.9
20% 28.1 MB/s
19,465 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 15,730,416 SSDs tested.


Approx. $131 @ launch in Oct '12
AmazonUS $16023 months
OutletPCUS $1982 years
EbayUS $31434 mins
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Typical 840 Pro 128GB Builds (Compare 14,111 builds) See popular component choices, score breakdowns and rankings.
Gaming 59%
Desktop 65%
Battle cruiser
Workstation 39%
Jet ski

Motherboard: Asrock Z77 Extreme4 - $167

EDIT WITH CUSTOM PC BUILDER Value: 62% - Good Total price: $921

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.

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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.
  • - 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) July 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.

1003 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 i7-8700K $350Nvidia GTX 1070 $400Samsung 850 Evo 250GB $104
AMD Ryzen 5 2600 $120Nvidia GTX 1060-6GB $250Samsung 850 Evo 500GB $103
AMD Ryzen 7 2700X $222Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $97
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $68SanDisk Extreme 64GB $45
Seagate Barracuda 3TB (2016) $70G.SKILL Trident Z DDR4 3200 C14 4x16GB $607SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $41Corsair Vengeance LPX DDR4 3200 C16 2x8GB $77SanDisk Ultra Fit 32GB $12
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