Average Bench: 149% (115th of 1011)

Based on 981 user benchmarks.  Model: WDC PC SN520 SDAPMUW-256G-1101

Outstanding average bench

The WDC PC SN520 SDAPMUW-256G-1101 256GB averaged 48.6% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the WDC PC SN520 SDAPMUW-256G-1101 256GB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 632MB/s
Avg. 4K-64Thread Write Speed 673MB/s

Poor consistency

The range of scores (95th - 5th percentile) for the WDC PC SN520 SDAPMUW-256G-1101 256GB is 62%. This is a particularly wide range which indicates that the WDC PC SN520 SDAPMUW-256G-1101 256GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 413MB/s
Avg. Sequential Mixed IO Speed 726MB/s

Average Bench

(Based on 981 samples)
Min Avg Max
609 Read 864 1,189
575 Write 826 1,150
477 Mixed 726 993
319 SusWrite 413 447
159% 707 MB/s
Min Avg Max
19.8 4K Read 37.8 47.2
64.5 4K Write 115 155
26 4K Mixed 52.7 68.5
185% 68.4 MB/s
Min Avg Max
410 DQ Read 744 861
310 DQ Write 673 961
341 DQ Mixed 632 733
495% 683 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
164GB free (System drive)
Firmware: 20210001
SusWrite @10s intervals: 564 412 407 402 398 404 MB/s
Read 1,153
Write 985
Mixed 979
SusWrite 431
199% 887 MB/s
4K Read 32.1
4K Write 88.4
4K Mixed 43.4
151% 54.6 MB/s
DQ Read 824
DQ Write 676
DQ Mixed 643
511% 714 MB/s
212GB free (System drive)
Firmware: 20210001
SusWrite @10s intervals: 457 404 412 419 420 422 MB/s
Read 1,030
Write 1,009
Mixed 886
SusWrite 422
188% 836 MB/s
4K Read 32.7
4K Write 113
4K Mixed 40.8
162% 62.2 MB/s
DQ Read 760
DQ Write 654
DQ Mixed 691
522% 701 MB/s
981 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 16,894,872 SSDs tested.


Popular PC SN520 SDAPMUW-256G-1101 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.

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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.
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Solid State Drive Rankings (Price vs Performance) August 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 $143Nvidia GTX 1660 $220Samsung 850 Evo 250GB $86
Intel Core i5-9600K $219Nvidia GTX 1660-Ti $270Samsung 850 Evo 500GB $102
AMD Ryzen 5 3600 $198AMD RX 580 $173Samsung 850 Pro 256GB $97
Seagate Barracuda 1TB (2016) $34Corsair Vengeance LPX DDR4 3000 C15 2x8GB $75SanDisk Extreme 64GB $88
WD Blue 1TB (2012) $42G.SKILL Trident Z DDR4 3200 C14 4x16GB $695SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $75Corsair Vengeance LPX DDR4 3200 C16 2x8GB $80SanDisk Extreme 16GB $24
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