Average Bench: 89.3% (328th of 1058)

Based on 33,183 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 10.7% 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 125MB/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 46.4%. 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 265MB/s
Avg. Sustained Write Speed 280MB/s

Average Bench

(Based on 33,183 samples)
Min Avg Max
342 Read 441 495
137 Write 330 447
172 Mixed 265 330
93.8 SusWrite 280 438
73.7% 329 MB/s
Min Avg Max
21.6 4K Read 30.5 36.4
47.7 4K Write 83.1 114
25.3 4K Mixed 36 43.8
136% 49.8 MB/s
Min Avg Max
212 DQ Read 332 376
95.4 DQ Write 241 320
93.8 DQ Mixed 125 155
137% 233 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
69GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 324 423 441 444 446 451 MB/s
Read 481
Write 416
Mixed 330
SusWrite 421
93% 412 MB/s
4K Read 36.3
4K Write 111
4K Mixed 45.3
172% 64.3 MB/s
DQ Read 363
DQ Write 320
DQ Mixed 157
168% 280 MB/s
87GB free
Firmware: DXM05B0Q
SusWrite @10s intervals: 428 435 434 442 437 439 MB/s
Read 483
Write 438
Mixed 328
SusWrite 436
95% 421 MB/s
4K Read 34.9
4K Write 102
4K Mixed 43.3
162% 60.1 MB/s
DQ Read 367
DQ Write 316
DQ Mixed 155
167% 279 MB/s
34GB free (System drive)
Firmware: DXM06B0Q
SusWrite @10s intervals: 369 346 326 305 285 269 MB/s
Read 461
Write 423
Mixed 295
SusWrite 317
84% 374 MB/s
4K Read 34.4
4K Write 108
4K Mixed 42.8
164% 61.9 MB/s
DQ Read 369
DQ Write 297
DQ Mixed 148
161% 271 MB/s
66GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 294 312 322 322 323 317 MB/s
Read 440
Write 344
Mixed 274
SusWrite 315
77% 343 MB/s
4K Read 20.6
4K Write 50.3
4K Mixed 26.4
92% 32.4 MB/s
DQ Read 366
DQ Write 311
DQ Mixed 119
149% 265 MB/s
33,183 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 56,071,775 SSDs tested.


MSRP ≈ $131 @ launch in Oct '12
EbayUS $6921 mins
AmazonUS $1604 years
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Typical 840 Pro 128GB Builds (Compare 9,884 builds) See popular component choices, score breakdowns and rankings.
Gaming 41%
Speed boat
Desktop 81%
Aircraft carrier
Workstation 32%
Sail boat

Motherboard: Asrock Z77 Extreme4 - $183

EDIT WITH CUSTOM PC BUILDER Value: 72% - Very good Total price: $623

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) June 2022 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 8 years ago.

Above average

8 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 i5-12600K $280Nvidia RTX 3060-Ti $400Crucial MX500 250GB $45
Intel Core i5-12400F $170Nvidia RTX 3070 $500Samsung 850 Evo 120GB $111
Intel Core i7-12700K $380Nvidia RTX 3050 $250Samsung 860 Evo 250GB $52
Seagate Barracuda 1TB (2016) $33Corsair Vengeance LPX DDR4 3200 C16 2x8GB $69SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $68SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $71G.SKILL Trident Z DDR4 3200 C14 4x16GB $470SanDisk Ultra Fit 32GB $16
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