Average Bench: 158% (116th of 1026)

Based on 1,713 user benchmarks.  Model: KBG40ZNS256G NVMe KIOXIA 256GB

Outstanding average bench

The Kbg40zns256g NVMe KIOXIA 256GB averaged 58.0% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Kbg40zns256g NVMe KIOXIA 256GB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 559MB/s
Avg. 4K-64Thread Read Speed 813MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Kbg40zns256g NVMe KIOXIA 256GB is 115%. This is a particularly wide range which indicates that the Kbg40zns256g NVMe KIOXIA 256GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 509MB/s
Avg. 4K Random Write Speed 87.4MB/s

Average Bench

(Based on 1,713 samples)
Min Avg Max
618 Read 1,120 1,498
423 Write 939 1,402
499 Mixed 974 1286
338 SusWrite 509 581
198% 886 MB/s
Min Avg Max
20.5 4K Read 40.8 52.8
37.4 4K Write 87.4 138
27 4K Mixed 53 71.7
176% 60.4 MB/s
Min Avg Max
303 DQ Read 813 1,232
134 DQ Write 415 750
215 DQ Mixed 559 696
430% 596 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
124GB free (System drive)
Firmware: 10410104 Max speed: PCIe 5,000 MB/s
SusWrite @10s intervals: 899 818 372 370 378 382 MB/s
Read 1,429
Write 1,230
Mixed 1,099
SusWrite 537
240% 1,074 MB/s
4K Read 45.1
4K Write 96.1
4K Mixed 59
195% 66.7 MB/s
DQ Read 776
DQ Write 428
DQ Mixed 556
426% 587 MB/s
174GB free
Firmware: 10410104 Max speed: PCIe 5,000 MB/s
SusWrite @10s intervals: 410 416 409 406 348 329 MB/s
Read 478
Write 446
Mixed 463
SusWrite 386
100% 443 MB/s
4K Read 47
4K Write 104
4K Mixed 62
206% 71 MB/s
DQ Read 830
DQ Write 424
DQ Mixed 684
493% 646 MB/s
1,713 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 29,454,362 SSDs tested.

Typical NVMe KIOXIA 256GB Builds (Compare 2,620 builds) See popular component choices, score breakdowns and rankings.
Gaming 16%
Desktop 87%
Aircraft carrier
Workstation 64%

System: Dell G7 7790


Popular NVMe KIOXIA 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.
  • - 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) August 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.


1026 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 $195Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $45
Intel Core i5-9400F $156Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $322Nvidia RTX 2070S (Super) $510Samsung 860 Evo 250GB $48
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $69SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $34Corsair Vengeance LPX DDR4 3000 C15 2x8GB $71SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $681SanDisk Extreme 16GB $24
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