Average Bench: 87.4% (279th of 992)

Based on 16,854 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 12.5% 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 121MB/s
Avg. 4K Random Read Speed 30.3MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 128GB is 49.6%. 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 258MB/s
Avg. Sustained Write Speed 264MB/s

Average Bench

(Based on 16,854 samples)
Min Avg Max
337 Read 439 491
118 Write 321 447
162 Mixed 258 326
86.7 SusWrite 264 434
71.6% 320 MB/s
Min Avg Max
22 4K Read 30.3 36.4
43.7 4K Write 83.4 118
24.6 4K Mixed 35.3 44.1
135% 49.7 MB/s
Min Avg Max
40.3 DQ Read 320 376
91.3 DQ Write 239 327
39.8 DQ Mixed 121 155
133% 227 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
95GB free (System drive)
Firmware: DXM04B0Q
SusWrite @10s intervals: 311 314 320 320 323 323 MB/s
Read 474
Write 313
Mixed 262
SusWrite 318
76% 342 MB/s
4K Read 31.2
4K Write 99.3
4K Mixed 38.1
149% 56.2 MB/s
DQ Read 370
DQ Write 286
DQ Mixed 115
144% 257 MB/s
49GB free (System drive)
Firmware: 5B0Q
SusWrite @10s intervals: 331 338 251 146 143 139 MB/s
Read 429
Write 352
Mixed 283
SusWrite 225
72% 322 MB/s
4K Read 31.8
4K Write 77.6
4K Mixed 37.2
137% 48.9 MB/s
DQ Read 369
DQ Write 304
DQ Mixed 122
150% 265 MB/s
23GB free (System drive)
Firmware: 5B0Q
SusWrite @10s intervals: 95 94 90 90 89 86 MB/s
Read 454
Write 279
Mixed 210
SusWrite 90.6
57% 258 MB/s
4K Read 31.8
4K Write 63.3
4K Mixed 37.7
130% 44.3 MB/s
DQ Read 302
DQ Write 134
DQ Mixed 136
122% 191 MB/s
33GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 165 147 141 137 137 136 MB/s
Read 336
Write 272
Mixed 210
SusWrite 144
54% 240 MB/s
4K Read 23.2
4K Write 43.2
4K Mixed 27.5
93% 31.3 MB/s
DQ Read 231
DQ Write 184
DQ Mixed 109
108% 175 MB/s
16,854 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 13,030,033 SSDs tested.


Approx. $131 @ launch in Oct '12
AmazonUS $16019 months
OutletPCUS $1982 years
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Typical 840 Pro 128GB Builds (Compare 12,355 builds) See popular component choices, score breakdowns and rankings.
Gaming 59%
Desktop 65%
Workstation 39%
Jet ski

Motherboard: Asrock Z77 Extreme4 - $167

EDIT WITH CUSTOM PC BUILDER Value: 63% - Good Total price: $896

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

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  • - 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.
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  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) March 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.

992 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 $370Nvidia GTX 1070 $370Samsung 850 Evo 250GB $75
AMD Ryzen 5 1600 $122Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $105
Intel Core i5-8600K $260Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $97
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3000 C15 2x8GB $105SanDisk Extreme 64GB $43
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $716SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $43Corsair Vengeance LPX DDR4 3200 C16 2x8GB $110SanDisk Ultra Fit 32GB $12
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