Average Bench: 67.4% (645th of 1016)

Based on 552 user benchmarks.  Model: SanDisk SD8SB8U128G1122

Above average average bench

The SanDisk X400 128GB averaged 32.5% 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 Mixed IO Speed 121MB/s
Avg. 4K Random Read Speed 28.3MB/s

Average consistency

The range of scores (95th - 5th percentile) for the SanDisk X400 128GB is 43.5%. This is a relatively wide range which indicates that the SanDisk X400 128GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 85MB/s
Avg. Sequential Write Speed 203MB/s

Average Bench

(Based on 552 samples)
Min Avg Max
334 Read 447 497
72.8 Write 203 330
103 Mixed 206 314
47.7 SusWrite 85 115
51.8% 235 MB/s
Min Avg Max
17.2 4K Read 28.3 38.4
24.2 4K Write 61.8 106
8.56 4K Mixed 26.6 46.4
110% 38.9 MB/s
Min Avg Max
27.6 DQ Read 250 363
43.2 DQ Write 171 262
8.98 DQ Mixed 121 228
115% 181 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
54GB free (System drive)
Firmware: X4120000
SusWrite @10s intervals: 113 85 86 83 86 83 MB/s
Read 434
Write 198
Mixed 150
SusWrite 89.3
48% 218 MB/s
4K Read 28.6
4K Write 56.8
4K Mixed 30.9
113% 38.8 MB/s
DQ Read 326
DQ Write 203
DQ Mixed 193
163% 241 MB/s
89GB free (System drive)
Firmware: X4140000
SusWrite @10s intervals: 96 96 92 97 92 91 MB/s
Read 350
Write 115
Mixed 196
SusWrite 93.9
42% 189 MB/s
4K Read 23.3
4K Write 34.7
4K Mixed 27
88% 28.3 MB/s
DQ Read 179
DQ Write 174
DQ Mixed 155
122% 169 MB/s
552 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 21,546,694 SSDs tested.


AmazonUS $771 min
EbayUS $877 mins
Send price feedback
Typical X400 128GB Builds (Compare 5,269 builds) See popular component choices, score breakdowns and rankings.
Gaming 71%
Desktop 63%
Workstation 47%

Motherboard: Asus H170-PRO - $105

EDIT WITH CUSTOM PC BUILDER Value: 55% - Above average Total price: $827

Popular X400 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 2020 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.


1016 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 $218Nvidia GTX 1660S (Super) $240Crucial MX500 250GB $42
Intel Core i5-9400F $154Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $356Nvidia RTX 2060 $349Samsung 850 Pro 512GB $224
Seagate Barracuda 1TB (2016) $37Corsair Vengeance LPX DDR4 3200 C16 2x8GB $73SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $42Corsair Vengeance LPX DDR4 3000 C15 2x8GB $63SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $653SanDisk Ultra Fit 32GB $16
Today's hottest deals
About  •  User Guide  •  FAQs  •  Email  •  Privacy  •  Developer Feedback