Average Bench: 61.2% (703rd of 1003)

Based on 1,181 user benchmarks.  Model: SAMSUNG SSD PM851 M.2 2280 256GB

Above average average bench

The Samsung PM851 M.2 2280 256GB averaged 38.8% 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 274MB/s
Avg. 4K Random Read Speed 21.4MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 M.2 2280 256GB is 46.1%. This is a relatively wide range which indicates that the Samsung PM851 M.2 2280 256GB performs inconsistently under varying real world conditions.


Avg. Sequential Mixed IO Speed 153MB/s
Avg. Sustained Write Speed 154MB/s

Average Bench

(Based on 1,181 samples)
Min Avg Max
319 Read 424 499
40.2 Write 166 260
73.9 Mixed 153 296
41 SusWrite 154 253
49.4% 224 MB/s
Min Avg Max
11.2 4K Read 21.4 29.6
20.6 4K Write 51.2 91.8
9.25 4K Mixed 19.8 29
84.8% 30.8 MB/s
Min Avg Max
24.7 DQ Read 274 370
40.7 DQ Write 149 255
12.5 DQ Mixed 61.6 81.9
85.9% 161 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
113GB free (System drive)
Firmware: EXT25D0Q
SusWrite @10s intervals: 179 230 212 121 57 52 MB/s
Read 442
Write 252
Mixed 159
SusWrite 142
55% 249 MB/s
4K Read 24.5
4K Write 47.1
4K Mixed 22.7
91% 31.4 MB/s
DQ Read 366
DQ Write 104
DQ Mixed 73.9
96% 182 MB/s
18GB free
Firmware: EXT25D0Q
SusWrite @10s intervals: 143 103 90 89 67 74 MB/s
Read 300
Write 259
Mixed 167
SusWrite 94.3
46% 205 MB/s
4K Read 12.9
4K Write 23
4K Mixed 14.9
51% 16.9 MB/s
DQ Read 163
DQ Write 154
DQ Mixed 69.6
77% 129 MB/s
1,181 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 15,791,568 SSDs tested.

Typical PM851 M.2 2280 256GB Builds (Compare 1,032 builds) See popular component choices, score breakdowns and rankings.
Gaming 14%
Tree trunk
Desktop 39%
Jet ski
Workstation 22%

System: Dell XPS 13 9343


Popular PM851 M.2 2280 256GB 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) July 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.


1003 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 i7-8700K $350Nvidia GTX 1070 $400Samsung 850 Evo 250GB $104
AMD Ryzen 5 2600 $127Nvidia GTX 1060-6GB $250Samsung 850 Evo 500GB $103
AMD Ryzen 7 2700X $248Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $97
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $68SanDisk Extreme 64GB $45
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $607SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $35Corsair Vengeance LPX DDR4 3200 C16 2x8GB $78SanDisk Ultra Fit 32GB $12
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