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WDWDS400T2X0E
IntelSSDPEKKW256G8XT

Release date: Q3 2022.

Release date ≈ Q1 2018.

Real World Speed
Performance profile from 28,867 user samples
8,772 User Benchmarks
Great bench: 683% 3.5TB free
Poor bench: 288% 2.5TB free (System drive)
Poor: 288% Great: 683%
SPEED RANK: 7th / 1080
20,095 User Benchmarks
Best Bench: 244% 56GB free (System drive)
Worst Bench: 131% 163GB free
Poor: 131% Great: 244%
SPEED RANK: 116th / 1080
Effective Speed
Effective SSD Speed
522 % Hugely faster effective speed.
+174%
190 %
Read
Avg. Sequential Read Speed
3,793 MB/s Hugely faster read speed.
+102%
1,875 MB/s
Write
Avg. Sequential Write Speed
3,816 MB/s Hugely faster write speed.
+325%
898 MB/s
4K Read
Avg. 4K Random Read Speed
67.2 MB/s Faster random read.
+15%
58.3 MB/s
4K Write
Avg. 4K Random Write Speed
189 MB/s Much faster random write.
+63%
116 MB/s
Mixed
Avg. Sequential Mixed IO Speed
2,970 MB/s Hugely faster mixed IO speed.
+279%
784 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed
83.5 MB/s Faster random mixed IO.
+24%
67.4 MB/s
SusWrite
Avg. Sustained Write Speed
3,370 MB/s Insanely faster sustained write speed.
+1,157%
268 MB/s
Read
Peak Sequential Read Speed
4,696 MB/s Hugely faster peak read speed.
+101%
2,333 MB/s
Write
Peak Sequential Write Speed
4,940 MB/s Hugely faster peak write speed.
+318%
1,183 MB/s
4K Read
Peak 4K Random Read Speed
84.7 MB/s Faster peak random read.
+18%
71.9 MB/s
4K Write
Peak 4K Random Write Speed
315 MB/s Much faster peak random write.
+49%
212 MB/s
Mixed
Peak Sequential Mixed IO Speed
3,586 MB/s Hugely faster peak mixed IO speed.
+217%
1,132 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed
113 MB/s Faster peak random mixed IO.
+13%
100 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average
4,656 MB/s Insanely faster peak sustained write speed.
+1,373%
316 MB/s
Market Share
Based on 77,606,585 SSDs tested
Market Share
Market Share (trailing 30 days)
0.2 % Hugely higher market share.
+567%
0.03 %
Value
Value For Money
272 % Hugely better value.
+375%
57.2 %
User Rating
UBM User Rating
72 % Much more popular.
+38%
52 %
Price
Price (score)
$250 $33 Hugely cheaper.
+87%
Age
Newest
27 Months Much more recent.
+67%
81+ Months
DQ Read
Peak 4K-64Thread Read Speed
2,486 MB/s Hugely faster peak deep queue read.
+200%
830 MB/s
DQ Write
Peak 4K-64Thread Write Speed
2,073 MB/s Hugely faster peak deep queue write.
+115%
965 MB/s
AS-SSD Total
AS-SSD Total Score
7,497 Pts Hugely stronger server IO.
+152%
2,977 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
2,284 MB/s Hugely faster peak deep queue mixed IO.
+251%
651 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed
1,787 MB/s Hugely faster deep queue read.
+150%
716 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed
1,382 MB/s Hugely faster deep queue write.
+197%
466 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
1,548 MB/s Hugely faster deep queue mixed IO.
+304%
383 MB/s
Capacity
Capacity
4TB 256GB

The WD Black SN850X has a superb consumer performance profile. As well as offering solid burst speeds of 5 GB/s, the SN850X also offers respectable out of cache performance. At current prices (1TB $90 USD, 2TB $145 USD and 4TB $290 USD) the WD Black SN850X is our top value pick at every capacity. [Jun '24 SSDrivePro]

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Is super fast. And my computer boot too fast i can't eat my bread. [Jun '19 msijonne]

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Solid State Drive Rankings (Price vs Performance) November 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]

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.
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

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

 Frequently Asked Questions

 Best User Rated

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The Best
CPUGPUSSD
Intel Core i5-13600K $210Nvidia RTX 4060 $285WD Black SN850X M.2 2TB $125
Intel Core i5-12600K $155Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $80
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $330
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