Average Bench: 50.8% (617th of 850)

Based on 191 user benchmarks.  Model: SAMSUNG SSD PM851 2.5 7mm 128GB

Average average bench

The Samsung PM851 2.5 7mm 128GB averaged 49.2% lower than the peak scores attained by the group leaders. This isn't a great result which indicates that there are much faster alternatives on the comparison list.


Avg. 4K Random Read Speed 21.2MB/s
Avg. Sequential Read Speed 461MB/s

Good consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 2.5 7mm 128GB is 23.6%. This is a relatively narrow range which indicates that the Samsung PM851 2.5 7mm 128GB performs reasonably consistently under varying real world conditions.


Avg. Sequential Write Speed 99.4MB/s
Avg. 4K-64Thread Mixed IO Speed 21.7MB/s

Average Bench

(Based on 191 samples)
Min Avg Max
356 Read 461 497
25.7 Write 99.4 135
53.5 Mixed 149 214
51.1% 237 MB/s
Min Avg Max
15.6 4K Read 21.2 27.5
25.1 4K Write 46.6 77.5
7.67 4K Mixed 10.8 13.3
70.6% 26.2 MB/s
Min Avg Max
19.5 DQ Read 173 353
33.6 DQ Write 90.2 138
8.73 DQ Mixed 21.7 33.3
45.5% 95 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
8GB free
Firmware: EXT08D0Q Max speed: SATA 3.0 600 MB/s
Read 490
Write 27.6
Mixed 38.6
39% 185 MB/s
4K Read 19.8
4K Write 32.6
4K Mixed 7.06
56% 19.8 MB/s
DQ Read 328
DQ Write 48.4
DQ Mixed 20
58% 132 MB/s
191 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 2,833,001 SSDs tested.

Typical PM851 2.5 7mm 128GB Builds (Compare 745 builds) See popular component choices, score breakdowns and rankings.
Gaming 74%
Desktop 68%
Battle cruiser
Workstation 65%

System: Alienware Area-51 R2

EDIT WITH CUSTOM PC BUILDER Value: 69% - Good Total price: $897

Popular PM851 2.5 7mm 128GB systems:

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 (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - 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 highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) May 2017 SSD Rankings.

Welcome to our consumer SSD comparison. We calculate effective speed based on real world performance then adjust by cost per GB to yield a value for money rating. Calculated values don't always tell the whole picture so we check them against thousands of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top SSDs. Share your opinion by voting. [SSDrivePro]

850 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 i7-7700K $309Nvidia GTX 1070 $368Samsung 850 Evo 250GB $102
Intel Core i5-7600K $240AMD RX 480 $210Samsung 850 Pro 256GB $127
AMD Ryzen 7 1700 $300Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $167
Seagate Barracuda 1TB (2016) $50Corsair Vengeance LPX DDR4 3000 C15 2x8GB $127SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $700SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $46Corsair Vengeance LPX DDR4 3200 C16 2x8GB $136SanDisk Ultra Fit 32GB $13
Today's hottest deals
User Guide  •  About  •  FAQs  •  Email  •  Privacy  •  Developer Feedback