Average Bench: 138% (156th of 1058)

Based on 1,662 user benchmarks.  Model: WDC PC SN520 SDAPNUW-256G-1014

Outstanding average bench

The WDC PC SN520 SDAPNUW-256G-1014 256GB averaged 38.4% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the WDC PC SN520 SDAPNUW-256G-1014 256GB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 532MB/s
Avg. 4K-64Thread Write Speed 558MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the WDC PC SN520 SDAPNUW-256G-1014 256GB is 104%. This is a particularly wide range which indicates that the WDC PC SN520 SDAPNUW-256G-1014 256GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 355MB/s
Avg. 4K Random Write Speed 102MB/s

Average Bench

(Based on 1,662 samples)
Min Avg Max
420 Read 890 1,216
311 Write 857 1,211
342 Mixed 709 1,091
206 SusWrite 355 441
158% 703 MB/s
Min Avg Max
18.6 4K Read 36.9 46.5
42.9 4K Write 102 148
24.4 4K Mixed 50.4 66.9
174% 63 MB/s
Min Avg Max
240 DQ Read 670 855
127 DQ Write 558 1,011
98.1 DQ Mixed 532 732
421% 587 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
63GB free (System drive)
Firmware: 20110000
SusWrite @10s intervals: 247 242 178 182 175 175 MB/s
Read 1,123
Write 1,041
Mixed 442
SusWrite 200
156% 701 MB/s
4K Read 34.2
4K Write 106
4K Mixed 57.1
181% 65.8 MB/s
DQ Read 797
DQ Write 910
DQ Mixed 737
587% 814 MB/s
117GB free (System drive)
Firmware: 20110000
SusWrite @10s intervals: 281 301 281 333 294 284 MB/s
Read 1,149
Write 1,110
Mixed 974
SusWrite 296
198% 882 MB/s
4K Read 38.3
4K Write 91.3
4K Mixed 44
163% 57.9 MB/s
DQ Read 780
DQ Write 631
DQ Mixed 676
514% 695 MB/s
160GB free (System drive)
Firmware: 20110000
SusWrite @10s intervals: 361 348 314 307 303 302 MB/s
Read 991
Write 1,053
Mixed 421
SusWrite 322
156% 697 MB/s
4K Read 32.4
4K Write 136
4K Mixed 57.4
194% 75.1 MB/s
DQ Read 490
DQ Write 514
DQ Mixed 489
371% 497 MB/s
1,662 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 45,555,228 SSDs tested.

Typical PC SN520 SDAPNUW-256G-1014 256GB Builds (Compare 1,066 builds) See popular component choices, score breakdowns and rankings.
Gaming 14%
Tree trunk
Desktop 72%
Workstation 12%
Tree trunk

System: Acer Aspire A515-44


Popular PC SN520 SDAPNUW-256G-1014 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.
  • - SkillBench (space shooter) tests user input accuracy.
  • - 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.
Solid State Drive Rankings (Price vs Performance) August 2021 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.


1058 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 i5-11600K $270Nvidia RTX 3070 $500Crucial MX500 250GB $45
Intel Core i5-11400F $260Nvidia RTX 3060-Ti $400Samsung 860 Evo 250GB $52
Intel Core i7-11700K $380Nvidia GTX 1660S (Super) $240Samsung 850 Evo 120GB $183
Seagate Barracuda 1TB (2016) $35Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $31Corsair Vengeance LPX DDR4 3000 C15 2x8GB $80SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
Today's hottest deals
About  •  User Guide  •  FAQs  •  Email  •  Privacy  •  Developer  •  YouTube Feedback