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WDWDS400T2X0E
Wd_black
▲ 72554 ▼

Release date: Q3 2022.

VS
▲ 500 ▼
  

Release date ≈ Q1 2023.

Effective Speed 
+7%
Real World Speed
Performance profile from 8,824 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
52 User Benchmarks
Best Bench: 705% 2TB free
Worst Bench: 417% 995GB free (System drive)
Poor: 417% Great: 705%
SPEED RANK: 5th / 1080
Effective Speed
Effective SSD Speed 		522 % 557 % Slightly faster effective speed.
+7%
Average Score 
+10%
Read
Avg. Sequential Read Speed 		3,793 MB/s 4,173 MB/s Faster read speed.
+10%
Write
Avg. Sequential Write Speed 		3,816 MB/s 4,183 MB/s Slightly faster write speed.
+10%
4K Read
Avg. 4K Random Read Speed 		67.2 MB/s 86.4 MB/s Faster random read.
+29%
4K Write
Avg. 4K Random Write Speed 		189 MB/s 214 MB/s Faster random write.
+13%
Mixed
Avg. Sequential Mixed IO Speed 		2,970 MB/s 3,071 MB/s +3%
4K Mixed
Avg. 4K Random Mixed IO Speed 		83.5 MB/s 90.4 MB/s Slightly faster random mixed IO.
+8%
SusWrite
Avg. Sustained Write Speed 		3,370 MB/s +1% 3,335 MB/s
Peak Score 
+4%
Read
Peak Sequential Read Speed 		4,696 MB/s 4,819 MB/s +3%
Write
Peak Sequential Write Speed 		4,940 MB/s 5,128 MB/s +4%
4K Read
Peak 4K Random Read Speed 		84.7 MB/s 88.7 MB/s +5%
4K Write
Peak 4K Random Write Speed 		315 MB/s 335 MB/s Slightly faster peak random write.
+6%
Mixed
Peak Sequential Mixed IO Speed 		3,586 MB/s +0% 3,573 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		113 MB/s 117 MB/s +4%
SusWrite
Peak Sequential Sustained Write 60s Average 		4,656 MB/s 4,930 MB/s Slightly faster peak sustained write speed.
+6%
Value & Sentiment 
+∞%
Market Share
Based on 77,550,567 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.19 % Insanely higher market share.
+∞% 		0 %
User Rating
UBM User Rating 		72 % Much more popular.
+44% 		50 %
Nice To Haves 
+11%
Age
Newest 		27 Months 20+ Months More recent.
+26%
DQ Read
Peak 4K-64Thread Read Speed 		2,486 MB/s 2,556 MB/s +3%
DQ Write
Peak 4K-64Thread Write Speed 		2,073 MB/s 2,262 MB/s Slightly faster peak deep queue write.
+9%
AS-SSD Total
AS-SSD Total Score 		7,497 Pts 7,860 Pts +5%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		2,284 MB/s 2,398 MB/s +5%
ADQ Read
Avg. 4K-64Thread Read Speed 		1,787 MB/s 1,939 MB/s Slightly faster deep queue read.
+9%
ADQ Write
Avg. 4K-64Thread Write Speed 		1,382 MB/s 1,597 MB/s Faster deep queue write.
+16%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		1,548 MB/s 1,755 MB/s Faster deep queue mixed IO.
+13%
Specifications 
Capacity
Capacity 		4TB 2TB
Conclusion 
Average Bench 522%
Average Bench 557%

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
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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.
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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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 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 »

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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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The Best
CPUGPUSSD
Intel Core i5-13600K $210Nvidia RTX 4060 $278WD Black SN850X M.2 2TB $135
Intel Core i5-12600K $159Nvidia 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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