Average Bench: 103% (228th of 1058)

Based on 2,119 user benchmarks.  Model: WDC PC SN520 SDAPNUW-128G-1014

Outstanding average bench

The WDC PC SN520 SDAPNUW-128G-1014 128GB averaged 3.3% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the WDC PC SN520 SDAPNUW-128G-1014 128GB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 279MB/s
Avg. 4K Random Mixed IO Speed 43MB/s

Very poor consistency

The range of scores (95th - 5th percentile) for the WDC PC SN520 SDAPNUW-128G-1014 128GB is 70.2%. This is a particularly wide range which indicates that the WDC PC SN520 SDAPNUW-128G-1014 128GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 189MB/s
Avg. Sequential Mixed IO Speed 437MB/s

Average Bench

(Based on 2,119 samples)
Min Avg Max
335 Read 717 933
153 Write 531 753
243 Mixed 437 722
112 SusWrite 189 228
104% 468 MB/s
Min Avg Max
15.6 4K Read 35.7 43.9
26.9 4K Write 86 136
19.8 4K Mixed 43 61.3
155% 54.9 MB/s
Min Avg Max
213 DQ Read 362 437
137 DQ Write 339 577
151 DQ Mixed 279 402
229% 327 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
62GB free (System drive)
Firmware: 20110000
SusWrite @10s intervals: 271 217 218 218 217 204 MB/s
Read 880
Write 756
Mixed 675
SusWrite 224
142% 634 MB/s
4K Read 37.3
4K Write 115
4K Mixed 47.8
178% 66.6 MB/s
DQ Read 311
DQ Write 369
DQ Mixed 404
287% 361 MB/s
88GB free (System drive)
Firmware: 20110000
SusWrite @10s intervals: 232 238 211 195 211 210 MB/s
Read 883
Write 756
Mixed 392
SusWrite 216
125% 562 MB/s
4K Read 30.6
4K Write 88.2
4K Mixed 43.5
149% 54.1 MB/s
DQ Read 313
DQ Write 346
DQ Mixed 230
201% 297 MB/s
66GB free (System drive)
Firmware: 20110000
SusWrite @10s intervals: 215 265 207 209 205 215 MB/s
Read 518
Write 470
Mixed 457
SusWrite 220
93% 416 MB/s
4K Read 25.3
4K Write 57.9
4K Mixed 32.8
111% 38.7 MB/s
DQ Read 294
DQ Write 204
DQ Mixed 323
221% 274 MB/s
2,119 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 47,327,311 SSDs tested.

Typical PC SN520 SDAPNUW-128G-1014 128GB Builds (Compare 2,792 builds) See popular component choices, score breakdowns and rankings.
Gaming 3%
Tree trunk
Desktop 48%
Workstation 3%
Tree trunk

System: Acer Aspire A515-43


Popular PC SN520 SDAPNUW-128G-1014 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.
  • - 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) September 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 3060-Ti $400Crucial MX500 250GB $45
Intel Core i5-11400F $260Nvidia RTX 3070 $500Samsung 860 Evo 250GB $52
Intel Core i7-11700K $390Nvidia GTX 1660S (Super) $240Samsung 850 Evo 120GB $183
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35Corsair Vengeance LPX DDR4 3000 C15 2x8GB $75SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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