Average Bench: 57.2% (769th of 1016)

Based on 661 user benchmarks.  Model: SAMSUNG SSD PM851 mSATA 128GB

Average average bench

The Samsung PM851 mSATA 128GB averaged 42.8% 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 283MB/s
Avg. 4K Random Read Speed 20.8MB/s

Good consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 128GB is 28.6%. This is a relatively narrow range which indicates that the Samsung PM851 mSATA 128GB performs reasonably consistently under varying real world conditions.


Avg. Sustained Write Speed 110MB/s
Avg. Sequential Write Speed 118MB/s

Average Bench

(Based on 661 samples)
Min Avg Max
344 Read 426 491
52.5 Write 118 138
74 Mixed 141 196
36.1 SusWrite 110 132
43.5% 199 MB/s
Min Avg Max
11.1 4K Read 20.8 28.9
23.7 4K Write 54.2 86.7
9.91 4K Mixed 17.5 23.7
82.5% 30.8 MB/s
Min Avg Max
26.6 DQ Read 283 364
44.7 DQ Write 114 140
12 DQ Mixed 52.2 64.4
77.2% 150 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
88GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 110 110 111 112 109 106 MB/s
Read 450
Write 123
Mixed 136
SusWrite 110
45% 204 MB/s
4K Read 27.2
4K Write 73.1
4K Mixed 22.6
109% 41 MB/s
DQ Read 348
DQ Write 120
DQ Mixed 62.2
91% 176 MB/s
88GB free (System drive)
Firmware: EXT49D0Q
SusWrite @10s intervals: 64 44 42 36 34 30 MB/s
Read 419
Write 126
Mixed 143
SusWrite 41.8
40% 182 MB/s
4K Read 18.8
4K Write 34.3
4K Mixed 14.8
66% 22.6 MB/s
DQ Read 342
DQ Write 93.6
DQ Mixed 51.1
81% 162 MB/s
119GB free
Firmware: EXT49D0Q
SusWrite @10s intervals: 135 134 134 134 133 133 MB/s
Read 311
Write 136
Mixed 145
SusWrite 134
40% 182 MB/s
4K Read 8.5
4K Write 35
4K Mixed 13.3
48% 18.9 MB/s
DQ Read 355
DQ Write 141
DQ Mixed 55.6
92% 184 MB/s
661 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 21,547,042 SSDs tested.

Typical PM851 mSATA 128GB Builds (Compare 2,834 builds) See popular component choices, score breakdowns and rankings.
Gaming 12%
Tree trunk
Desktop 40%
Jet ski
Workstation 21%

System: Dell Latitude E7240


Popular PM851 mSATA 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) January 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.


1016 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 $218Nvidia GTX 1660S (Super) $240Crucial MX500 250GB $42
Intel Core i5-9400F $154Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $356Nvidia RTX 2060 $349Samsung 850 Pro 512GB $224
Seagate Barracuda 1TB (2016) $37Corsair Vengeance LPX DDR4 3200 C16 2x8GB $73SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $42Corsair Vengeance LPX DDR4 3000 C15 2x8GB $63SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $653SanDisk Ultra Fit 32GB $16
Today's hottest deals
About  •  User Guide  •  FAQs  •  Email  •  Privacy  •  Developer Feedback