Average Bench: 82.1% (417th of 1039)

Based on 585 user benchmarks.  Models: KINGSTON SKC400S37128G, KINGSTON KINGSTON SKC400S, KINGSTON SKC400S3712, KINGSTON SKC400S, KINGSTON SKC400S37128G

Very good average bench

The Kingston SSDNow KC400 128GB averaged just 17.9% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Kingston SSDNow KC400 128GB near the top of the comparison list.


Avg. 4K Random Mixed IO Speed 32.2MB/s
Avg. 4K-64Thread Write Speed 263MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Kingston SSDNow KC400 128GB is 49%. This is a relatively wide range which indicates that the Kingston SSDNow KC400 128GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 265MB/s
Avg. Sequential Mixed IO Speed 270MB/s

Average Bench

(Based on 585 samples)
Min Avg Max
204 Read 428 512
97.8 Write 329 422
149 Mixed 270 309
117 SusWrite 265 402
72.3% 323 MB/s
Min Avg Max
16.7 4K Read 25.4 31.5
35.6 4K Write 71.6 113
19.8 4K Mixed 32.2 40.7
118% 43.1 MB/s
Min Avg Max
30.3 DQ Read 303 358
77.3 DQ Write 263 368
33.8 DQ Mixed 60.8 67.1
106% 209 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
32GB free
Firmware: SAFM001B
SusWrite @10s intervals: 409 408 402 381 236 278 MB/s
Read 504
Write 410
Mixed 310
SusWrite 352
88% 394 MB/s
4K Read 30.8
4K Write 99.2
4K Mixed 39.5
150% 56.5 MB/s
DQ Read 353
DQ Write 363
DQ Mixed 66.8
130% 261 MB/s
117GB free
Firmware: SAFM001A
SusWrite @10s intervals: 362 374 401 397 388 389 MB/s
Read 456
Write 392
Mixed 295
SusWrite 385
86% 382 MB/s
4K Read 25.6
4K Write 76.7
4K Mixed 33.7
123% 45.3 MB/s
DQ Read 350
DQ Write 314
DQ Mixed 66.4
122% 243 MB/s
35GB free (System drive)
Firmware: SAFM
SusWrite @10s intervals: 332 303 338 261 289 233 MB/s
Read 328
Write 380
Mixed 278
SusWrite 292
72% 320 MB/s
4K Read 28.2
4K Write 81.5
4K Mixed 36.6
133% 48.8 MB/s
DQ Read 231
DQ Write 190
DQ Mixed 65.4
88% 162 MB/s
585 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 37,817,480 SSDs tested.


AmazonUS $963 mins
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Typical SSDNow KC400 128GB Builds (Compare 19,988 builds) See popular component choices, score breakdowns and rankings.
Gaming 93%
Nuclear submarine
Desktop 88%
Aircraft carrier
Workstation 88%
Aircraft carrier

Motherboard: MSI B450 GAMING PLUS MAX (MS-7B86)

EDIT WITH CUSTOM PC BUILDER Value: 66% - Good Total price: $773

Popular SSDNow KC400 128GB compatible motherboards:

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 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.


1039 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 $208Nvidia RTX 3060-Ti $400Crucial MX500 250GB $47
Intel Core i5-10600K $257Nvidia RTX 3070 $500Samsung 850 Evo 120GB $78
Intel Core i5-10400F $161Nvidia GTX 1660S (Super) $240Samsung 860 Evo 250GB $40
Seagate Barracuda 1TB (2016) $47Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $71SanDisk Extreme 32GB $28
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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