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WDWDS400T2X0E
▲ 72554 ▼

Release date: Q3 2022.

VS
▲ 500 ▼
  

Release date ≈ Q3 2022.

Effective Speed 
+10%
Real World Speed
Performance profile from 9,193 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
421 User Benchmarks
Great bench: 561% 954GB free
Poor bench: 308% 885GB free (System drive)
Poor: 308% Great: 561%
SPEED RANK: 9th / 1080
Effective Speed
Effective SSD Speed 		522 % Faster effective speed.
+10% 		474 %
Average Score 
+7%
Read
Avg. Sequential Read Speed 		3,793 MB/s 4,299 MB/s Faster read speed.
+13%
Write
Avg. Sequential Write Speed 		3,816 MB/s Faster write speed.
+15% 		3,330 MB/s
4K Read
Avg. 4K Random Read Speed 		67.2 MB/s +3% 65.1 MB/s
4K Write
Avg. 4K Random Write Speed 		189 MB/s 220 MB/s Faster random write.
+16%
Mixed
Avg. Sequential Mixed IO Speed 		2,970 MB/s Faster mixed IO speed.
+22% 		2,426 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		83.5 MB/s 96.6 MB/s Faster random mixed IO.
+16%
SusWrite
Avg. Sustained Write Speed 		3,370 MB/s Much faster sustained write speed.
+52% 		2,216 MB/s
Peak Score 
+14%
Read
Peak Sequential Read Speed 		4,696 MB/s 5,011 MB/s Slightly faster peak read speed.
+7%
Write
Peak Sequential Write Speed 		4,940 MB/s Faster peak write speed.
+22% 		4,041 MB/s
4K Read
Peak 4K Random Read Speed 		84.7 MB/s +4% 81.2 MB/s
4K Write
Peak 4K Random Write Speed 		315 MB/s Slightly faster peak random write.
+8% 		293 MB/s
Mixed
Peak Sequential Mixed IO Speed 		3,586 MB/s Faster peak mixed IO speed.
+19% 		3,005 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		113 MB/s 123 MB/s Slightly faster peak random mixed IO.
+9%
SusWrite
Peak Sequential Sustained Write 60s Average 		4,656 MB/s Much faster peak sustained write speed.
+59% 		2,929 MB/s
Value & Sentiment 
+305%
Market Share
Based on 77,606,327 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.2 % Hugely higher market share.
+567% 		0.03 %
User Rating
UBM User Rating 		72 % Much more popular.
+44% 		50 %
Nice To Haves 
+15%
Age
Newest 		27 Months 26+ Months +4%
DQ Read
Peak 4K-64Thread Read Speed 		2,486 MB/s Faster peak deep queue read.
+20% 		2,075 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		2,073 MB/s Faster peak deep queue write.
+24% 		1,670 MB/s
AS-SSD Total
AS-SSD Total Score 		7,497 Pts Stronger server IO.
+18% 		6,345 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		2,284 MB/s Faster peak deep queue mixed IO.
+23% 		1,863 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		1,787 MB/s Faster deep queue read.
+11% 		1,607 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		1,382 MB/s Faster deep queue write.
+15% 		1,201 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		1,548 MB/s Faster deep queue mixed IO.
+11% 		1,398 MB/s
Specifications 
Capacity
Capacity 		4TB 1TB
Conclusion 
Average Bench 522%
Average Bench 474%

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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421
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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

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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?
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ALL FAQs »

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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 $160Nvidia 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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