Average Bench: 88.9% (334th of 1058)

Based on 29,259 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 11.1% 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 123MB/s
Avg. 4K Random Read Speed 30.6MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 128GB is 49.2%. 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 264MB/s
Avg. Sustained Write Speed 281MB/s

Average Bench

(Based on 29,259 samples)
Min Avg Max
347 Read 448 497
132 Write 331 448
175 Mixed 264 329
89.4 SusWrite 281 442
74% 331 MB/s
Min Avg Max
22.1 4K Read 30.6 36.3
40.6 4K Write 80.3 113
25.2 4K Mixed 35.7 44.2
135% 48.9 MB/s
Min Avg Max
111 DQ Read 327 376
89.7 DQ Write 236 325
76.9 DQ Mixed 123 156
135% 229 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
64GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 336 342 343 344 344 339 MB/s
Read 495
Write 346
Mixed 301
SusWrite 341
83% 371 MB/s
4K Read 37.7
4K Write 124
4K Mixed 42.4
177% 67.9 MB/s
DQ Read 374
DQ Write 308
DQ Mixed 127
153% 270 MB/s
41GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 314 305 299 304 314 307 MB/s
Read 472
Write 383
Mixed 291
SusWrite 307
81% 363 MB/s
4K Read 32.3
4K Write 81
4K Mixed 39.3
142% 50.9 MB/s
DQ Read 214
DQ Write 183
DQ Mixed 117
110% 171 MB/s
26GB free (System drive)
Firmware: 5B0Q
SusWrite @10s intervals: 349 329 285 245 207 183 MB/s
Read 388
Write 364
Mixed 284
SusWrite 266
73% 326 MB/s
4K Read 30.4
4K Write 78.1
4K Mixed 37.9
136% 48.8 MB/s
DQ Read 366
DQ Write 320
DQ Mixed 146
163% 277 MB/s
28GB free
Firmware: DXM05B0Q
SusWrite @10s intervals: 308 357 321 383 204 139 MB/s
Read 457
Write 427
Mixed 304
SusWrite 285
83% 368 MB/s
4K Read 30.1
4K Write 64.4
4K Mixed 35.7
125% 43.4 MB/s
DQ Read 312
DQ Write 326
DQ Mixed 140
155% 260 MB/s
29,259 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 43,099,589 SSDs tested.


MSRP ≈ $131 @ launch in Oct '12
AmazonUS $1603 years
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Typical 840 Pro 128GB Builds (Compare 6,341 builds) See popular component choices, score breakdowns and rankings.
Gaming 63%
Desktop 82%
Aircraft carrier
Workstation 49%

Motherboard: MSI Z87-G45 GAMING (MS-7821) - $242

EDIT WITH CUSTOM PC BUILDER Value: 50% - Average Total price: $1,202

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.
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  • - Explore your best upgrade options with a virtual PC build.
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  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) May 2021 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 7 years ago.

Above average

7 years ago.

1058 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 i5-11400F $220Nvidia RTX 3060-Ti $400Crucial MX500 250GB $49
Intel Core i5-11600K $259Nvidia RTX 3070 $500Samsung 850 Evo 120GB $78
Intel Core i5-10600K $210Nvidia RTX 3080 $700Samsung 860 Evo 250GB $50
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $102SanDisk Extreme 32GB $28
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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