Average Bench: 88.1% (321st of 1037)

Based on 26,822 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 11.8% 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 124MB/s
Avg. 4K Random Read Speed 30.4MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 128GB is 48.3%. 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 266MB/s

Average Bench

(Based on 26,822 samples)
Min Avg Max
340 Read 443 494
113 Write 322 447
159 Mixed 260 329
80.4 SusWrite 266 437
72.2% 323 MB/s
Min Avg Max
21.1 4K Read 30.4 36.2
41.4 4K Write 82.3 114
26 4K Mixed 35.7 43.7
135% 49.4 MB/s
Min Avg Max
209 DQ Read 333 377
92.3 DQ Write 239 333
81.2 DQ Mixed 124 155
137% 232 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
70GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 311 307 287 306 307 305 MB/s
Read 498
Write 294
Mixed 280
SusWrite 304
77% 344 MB/s
4K Read 35.9
4K Write 112
4K Mixed 41.3
167% 63.2 MB/s
DQ Read 364
DQ Write 286
DQ Mixed 125
148% 258 MB/s
49GB free
Firmware: DXM05B0Q
SusWrite @10s intervals: 348 370 372 375 376 377 MB/s
Read 374
Write 375
Mixed 287
SusWrite 370
79% 351 MB/s
4K Read 32.3
4K Write 77.9
4K Mixed 39.5
141% 49.9 MB/s
DQ Read 232
DQ Write 197
DQ Mixed 125
118% 185 MB/s
58GB free (System drive)
Firmware: DXM06B0Q
SusWrite @10s intervals: 317 338 330 332 330 306 MB/s
Read 445
Write 343
Mixed 274
SusWrite 325
78% 347 MB/s
4K Read 21
4K Write 35.9
4K Mixed 22.5
80% 26.5 MB/s
DQ Read 258
DQ Write 159
DQ Mixed 118
112% 178 MB/s
7GB free (System drive)
Firmware: DXM04B0Q
SusWrite @10s intervals: 71 55 46 46 43 43 MB/s
Read 356
Write 87.5
Mixed 133
SusWrite 50.7
34% 157 MB/s
4K Read 27.7
4K Write 70.8
4K Mixed 26.6
114% 41.7 MB/s
DQ Read 354
DQ Write 89
DQ Mixed 92.8
102% 178 MB/s
26,822 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 31,610,979 SSDs tested.


Approx. $131 @ launch in Oct '12
AmazonUS $1603 years
OutletPCUS $1983 years
Send price feedback
Typical 840 Pro 128GB Builds (Compare 4,278 builds) See popular component choices, score breakdowns and rankings.
Gaming 42%
Speed boat
Desktop 82%
Aircraft carrier
Workstation 33%
Sail boat

Motherboard: Asrock Z77 Extreme4 - $183

EDIT WITH CUSTOM PC BUILDER Value: 39% - Below average Total price: $937

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) September 2020 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 6 years ago.

Above average

6 years ago.

1037 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 i5-9600K $195Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $45
Intel Core i5-9400F $140Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $289Nvidia RTX 2070S (Super) $505Samsung 860 Evo 250GB $43
Seagate Barracuda 1TB (2016) $35Corsair Vengeance LPX DDR4 3200 C16 2x8GB $69SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $65SanDisk Extreme 32GB $30
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Extreme 16GB $28
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