TEST
YOUR SSD
ADD TO PC
BUILD

Nvme

KBG40ZNS256G KIOXIA 256GB

▲ 500 ▼

Release date ≈ Q4 2020.

Average Bench: 160% (152nd of 1080)

Based on 2,731 user benchmarks.  Model: NVMe KBG40ZNS256G NVMe KIOXIA 256GB
Poor: 87%Average: 160% Great: 230%

Popular builds with this SSD

Outstanding average bench

The Nvme KBG40ZNS256G KIOXIA 256GB averaged 59.6% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Nvme KBG40ZNS256G KIOXIA 256GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 517MB/s
Avg. 4K-64Thread Read Speed 826MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Nvme KBG40ZNS256G KIOXIA 256GB is 143%. This is a particularly wide range which indicates that the Nvme KBG40ZNS256G KIOXIA 256GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sustained Write Speed 422MB/s
Avg. 4K-64Thread Write Speed 396MB/s
ADVERTISEMENT

Average Bench

(Based on 2,731 samples)
Rank 152160%
Min Avg Max
492 Read 1,088 1,551
97.9 Write 853 1,469
139 Mixed 882 1,312
68.5 SusWrite 422 574
181% 811 MB/s
Min Avg Max
18.1 4K Read 47.1 58
35.6 4K Write 113 196
24.8 4K Mixed 57.9 79.8
205% 72.7 MB/s
Min Avg Max
328 DQ Read 826 1,371
80.9 DQ Write 396 802
104 DQ Mixed 517 702
408% 580 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
147GB free (System drive)
Firmware: 10410106 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 627 684 675 384 393 398 MB/s
164% Outstanding
Read 1,121
Write 1,012
Mixed 954
SusWrite 527
203% 903 MB/s
4K Read 47.4
4K Write 115
4K Mixed 55.4
204% 72.5 MB/s
DQ Read 749
DQ Write 364
DQ Mixed 577
423% 563 MB/s
238GB free
Firmware: 10410106 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 640 526 299 455 352 204 MB/s
162% Outstanding
Read 1,127
Write 805
Mixed 890
SusWrite 412
181% 808 MB/s
4K Read 51.2
4K Write 113
4K Mixed 66.6
223% 76.9 MB/s
DQ Read 914
DQ Write 87.8
DQ Mixed 631
427% 544 MB/s
92GB free (System drive)
Firmware: 10410106 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 596 446 378 455 227 182 MB/s
140% Outstanding
Read 1,003
Write 525
Mixed 691
SusWrite 381
144% 650 MB/s
4K Read 40.9
4K Write 86.9
4K Mixed 56.1
180% 61.3 MB/s
DQ Read 682
DQ Write 250
DQ Mixed 365
296% 432 MB/s
46GB free (System drive)
Firmware: 10410106 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 121 205 165 122 118 86 MB/s
126% Outstanding
Read 1,040
Write 318
Mixed 356
SusWrite 136
101% 462 MB/s
4K Read 38.6
4K Write 109
4K Mixed 46.4
176% 64.8 MB/s
DQ Read 847
DQ Write 154
DQ Mixed 124
188% 375 MB/s
46GB free (System drive)
Firmware: 10410106 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 97 88 107 40 12 27 MB/s
107% Outstanding
Read 1,034
Write 274
Mixed 148
SusWrite 61.6
82% 380 MB/s
4K Read 36.3
4K Write 54.2
4K Mixed 40
135% 43.5 MB/s
DQ Read 828
DQ Write 86
DQ Mixed 95.8
162% 337 MB/s
107GB free (System drive)
Firmware: 10410104 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 393 497 440 319 304 313 MB/s
94.1% Outstanding
Read 894
Write 582
Mixed 892
SusWrite 378
154% 686 MB/s
4K Read 24.7
4K Write 39.8
4K Mixed 30.3
97% 31.6 MB/s
DQ Read 140
DQ Write 72.4
DQ Mixed 79.4
66% 97.1 MB/s
2,731 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 76,510,326 SSDs tested

Custom PC Builder (Start a new build) Build your perfect PC: compare component prices, popularity, speed and value for money

CHOOSE A COMPONENT:

CPU GPU SSD HDD RAM MBD
Typical KBG40ZNS256G KIOXIA 256GB Builds (Compare 3,757 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 15%
Tree trunk
Desktop
Desktop 76%
Battleship
Workstation
Workstation 13%
Tree trunk

System: Dell Latitude 5420

CPU
Core i5-1135G7IntelBench 69%, 36,962 samples1,432x
Core i5-1145G7IntelBench 69%, 4,608 samples1,146x
Core i7-1185G7IntelBench 67%, 9,588 samples783x
GPU
Iris XeIntelBench 14%, 144,774 samples3,652x
UHD GraphicsIntelBench 9%, 39,662 samples67x
UHD GraphicsIntelBench 5%, 110,580 samples24x
SSD
KBG40ZNS256G KIOXIA 256GBNvmeBench 160%, 2,731 samples1x
RAM
HMAA2GS6AJR8N-XN 1x16GBUnknownBench 48%, 1,650 samples889x
HMAA2GS6CJR8N-XN 1x16GBUnknownBench 40%, 3,085 samples465x
HMAA1GS6CJR6N-XN 1x8GBUnknownBench 32%, 13,137 samples297x
EDIT WITH CUSTOM PC BUILDER

Popular KBG40ZNS256G KIOXIA 256GB systems:

How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute

Welcome to our 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 value for money upgrades.

UserBenchmark of the month

Gaming Desktop ProGaming

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) July 2024 SSD Rankings

Welcome to our 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]

ADVERTISEMENT

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.

 Comments

Added n/a ago.
Your
opinion?
▲Like ▼Dislike
Ready to retire
Age: 3 years

Speed Comparisons

vs WD Black SN850X M.2 2TB
vs WD Black SN850X M.2 1TB
vs Crucial T700 M.2 4TB
vs WD Black SN850X M.2 4TB
vs Samsung 990 Pro M.2 2TB
vs Samsung 990 Pro M.2 4TB
vs Samsung 990 Pro M.2 1TB
vs Crucial T705 M.2 2TB
vs Crucial T705 M.2 1TB

1080 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

Storage Devices FAQ
What is sustained sequential write speed?
What’s the difference between SLC, MLC and TLC?
What is 3D XPoint and how fast is it?
What’s the difference between SATA, PCIe and NVMe?
What’s the difference between NAND and V-NAND?
What is sequential write speed?
What is sequential read speed?
What is incompressible data?
What is queue depth?
Solid State Drives
What is the SSD value for money rating?
What is 4K 64 thread write speed?
Can CPU power saving states (C1,C2,C3) impact SSD speed?
What is the effective SSD speed index?
How is the AS SSD write score calculated?
How is the AS SSD read score calculated?
How is the AS SSD total score calculated?
ALL FAQs »

 Best User Rated
Why does UserBenchmark have a bad reputation on reddit?
Marketers operate thousands of reddit accounts. Our benchmarks expose their spiel so they attack our reputation.
Why don’t PC brands endorse UserBenchmark?
Brands make boatloads on flagships like the 4090 and 14900KS. We help users get similar real-world performance for less money.
Why don’t youtubers promote UserBenchmark?
We don't pay youtubers, so they don't praise us. Moreover, our data obstructs youtubers who promote overpriced or inferior products.
Why does UserBenchmark have negative trustpilot reviews?
The 200+ trustpilot reviews are mostly written by virgin marketing accounts. Real users don't give a monkey's about big brands.
Why is UserBenchmark popular with users?
Instead of pursuing brands for sponsorship, we've spent 13 years publishing real-world data for users.
The Best
CPUGPUSSD
Intel Core i5-12600K $175Nvidia RTX 4060 $293WD Black SN850X M.2 2TB $145
Intel Core i5-12400F $110Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $85
Intel Core i5-13600K $235Nvidia RTX 4070 $499Crucial T700 M.2 4TB $342
Today's hottest
Amazon Ebay
deals
If you buy something via a price link, UserBenchmark may earn a commission
Build Test EFps
Can You Run It?
►
YouTube
*NEW*
About  •  User Guide  •  FAQs  •  Email  •  Privacy  •  Developer  •  YouTube Feedback