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WDWDS400T2X0E
Sandisk
▲ 72554 ▼

Release date: Q3 2022.

VS
▲ 504 ▼
  

Release date ≈ Q3 2017.

Effective Speed 
+1,101%
Real World Speed
Performance profile from 33,683 user samples
Benchmark your SSD here
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
24,911 User Benchmarks
Best Bench: 56% 59GB free
Worst Bench: 29% 28GB free (System drive)
Poor: 29% Great: 56%
SPEED RANK: 936th / 1080
Effective Speed
Effective SSD Speed 		522 % Insanely faster effective speed.
+1,101% 		43.5 %
Average Score 
+1,304%
Read
Avg. Sequential Read Speed 		3,793 MB/s Hugely faster read speed.
+810% 		417 MB/s
Write
Avg. Sequential Write Speed 		3,816 MB/s Insanely faster write speed.
+1,538% 		233 MB/s
4K Read
Avg. 4K Random Read Speed 		67.2 MB/s Hugely faster random read.
+257% 		18.8 MB/s
4K Write
Avg. 4K Random Write Speed 		189 MB/s Hugely faster random write.
+595% 		27.2 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		2,970 MB/s Insanely faster mixed IO speed.
+1,400% 		198 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		83.5 MB/s Hugely faster random mixed IO.
+472% 		14.6 MB/s
SusWrite
Avg. Sustained Write Speed 		3,370 MB/s Insanely faster sustained write speed.
+4,055% 		81.1 MB/s
Peak Score 
+1,047%
Read
Peak Sequential Read Speed 		4,696 MB/s Hugely faster peak read speed.
+919% 		461 MB/s
Write
Peak Sequential Write Speed 		4,940 MB/s Insanely faster peak write speed.
+1,250% 		366 MB/s
4K Read
Peak 4K Random Read Speed 		84.7 MB/s Hugely faster peak random read.
+267% 		23.1 MB/s
4K Write
Peak 4K Random Write Speed 		315 MB/s Hugely faster peak random write.
+643% 		42.4 MB/s
Mixed
Peak Sequential Mixed IO Speed 		3,586 MB/s Insanely faster peak mixed IO speed.
+1,053% 		311 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		113 MB/s Hugely faster peak random mixed IO.
+474% 		19.7 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		4,656 MB/s Insanely faster peak sustained write speed.
+2,722% 		165 MB/s
Value & Sentiment 
+1,322%
Market Share
Based on 77,529,883 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.27 % Insanely higher market share.
+2,600% 		0.01 %
User Rating
UBM User Rating 		72 % Much more popular.
+44% 		50 %
Nice To Haves 
+2,422%
Age
Newest 		27 Months Much more recent.
+68% 		85+ Months
DQ Read
Peak 4K-64Thread Read Speed 		2,486 MB/s Insanely faster peak deep queue read.
+1,955% 		121 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		2,073 MB/s Insanely faster peak deep queue write.
+2,148% 		92.2 MB/s
AS-SSD Total
AS-SSD Total Score 		7,497 Pts Insanely stronger server IO.
+1,518% 		463 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		2,284 MB/s Insanely faster peak deep queue mixed IO.
+5,163% 		43.4 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		1,787 MB/s Insanely faster deep queue read.
+1,555% 		108 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		1,382 MB/s Insanely faster deep queue write.
+2,381% 		55.7 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		1,548 MB/s Insanely faster deep queue mixed IO.
+4,591% 		33 MB/s
Specifications 
Capacity
Capacity 		4TB 240GB
Conclusion 
Average Bench 522%
Average Bench 43.5%

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]

MORE DETAILS

User Builds 
8,772
24,911
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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.

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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

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.
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Brands make boatloads on flagships like the 4090 and 14900KS. We help users get similar real-world performance for less money.
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We don't pay youtubers, so they don't praise us. Moreover, our data obstructs youtubers who promote overpriced or inferior products.
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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 the gold standard for 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 $159Nvidia RTX 4060 $280WD Black SN850X M.2 2TB $135
Intel Core i5-13600K $210Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $84
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $370
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