Average Bench: 59.6% (736th of 1011)

Based on 1,139 user benchmarks.  Model: SAMSUNG SSD PM851 2.5 7mm 128GB

Average average bench

The Samsung PM851 2.5 7mm 128GB averaged 40.3% 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-64Thread Read Speed 310MB/s
Avg. 4K Random Read Speed 22.9MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 2.5 7mm 128GB is 33.7%. 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. Sustained Write Speed 99.6MB/s
Avg. Sequential Write Speed 110MB/s

Average Bench

(Based on 1,139 samples)
Min Avg Max
339 Read 432 498
40.5 Write 110 139
62 Mixed 130 161
29 SusWrite 99.6 134
42.1% 193 MB/s
Min Avg Max
13.1 4K Read 22.9 30.7
23.5 4K Write 56.7 103
12.5 4K Mixed 20 25.9
90.3% 33.2 MB/s
Min Avg Max
80.4 DQ Read 310 365
33 DQ Write 107 141
25.8 DQ Mixed 55.4 65.2
81% 157 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
89GB free (System drive)
Firmware: EXT08D0Q
SusWrite @10s intervals: 133 132 120 127 124 126 MB/s
Read 473
Write 133
Mixed 161
SusWrite 127
49% 223 MB/s
4K Read 29.3
4K Write 68.4
4K Mixed 26.7
115% 41.5 MB/s
DQ Read 352
DQ Write 140
DQ Mixed 65.2
96% 186 MB/s
7GB free
Firmware: EXT08D0Q
SusWrite @10s intervals: 98 92 43 35 32 30 MB/s
Read 454
Write 105
Mixed 119
SusWrite 54.9
40% 183 MB/s
4K Read 33.3
4K Write 76.9
4K Mixed 25.2
124% 45.1 MB/s
DQ Read 335
DQ Write 88.7
DQ Mixed 54.9
81% 160 MB/s
1,139 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 19,105,085 SSDs tested.

Typical PM851 2.5 7mm 128GB Builds (Compare 3,008 builds) See popular component choices, score breakdowns and rankings.
Gaming 88%
Aircraft carrier
Desktop 65%
Workstation 58%

System: Alienware Area-51 R2

EDIT WITH CUSTOM PC BUILDER Value: 55% - Above average Total price: $877

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.
  • - 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) November 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.


1011 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 i5-9400F $148Nvidia GTX 1660 $210Crucial MX500 250GB $45
Intel Core i5-9600K $210Nvidia GTX 1660S (Super) $234Samsung 850 Evo 120GB $150
Intel Core i7-9700K $349Nvidia GTX 1660-Ti $260Samsung 860 Evo 250GB $49
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $65SanDisk Extreme 64GB $88
WD Blue 1TB (2012) $40G.SKILL Trident Z DDR4 3200 C14 4x16GB $612SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $75Corsair Vengeance LPX DDR4 3200 C16 2x8GB $68SanDisk Ultra Fit 32GB $14
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