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WDWDS400T2X0E
▲ 72554 ▼

Release date: Q3 2022.

VS
▲ 500 ▼
  

Release date ≈ Q2 2023.

Effective Speed 
+112%
Real World Speed
Performance profile from 8,838 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
66 User Benchmarks
Best Bench: 312% 877GB free (System drive)
Worst Bench: 184% 891GB free (System drive)
Poor: 184% Great: 312%
SPEED RANK: 66th / 1080
Effective Speed
Effective SSD Speed 		522 % Hugely faster effective speed.
+112% 		246 %
Average Score 
+106%
Read
Avg. Sequential Read Speed 		3793 MB/s Hugely faster read speed.
+119% 		1731 MB/s
Write
Avg. Sequential Write Speed 		3816 MB/s Hugely faster write speed.
+165% 		1438 MB/s
4K Read
Avg. 4K Random Read Speed 		67.2 MB/s Much faster random read.
+48% 		45.5 MB/s
4K Write
Avg. 4K Random Write Speed 		189 MB/s Much faster random write.
+41% 		134 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		2970 MB/s Hugely faster mixed IO speed.
+173% 		1089 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		83.5 MB/s Much faster random mixed IO.
+53% 		54.6 MB/s
SusWrite
Avg. Sustained Write Speed 		3370 MB/s Hugely faster sustained write speed.
+143% 		1384 MB/s
Peak Score 
+112%
Read
Peak Sequential Read Speed 		4696 MB/s Hugely faster peak read speed.
+138% 		1974 MB/s
Write
Peak Sequential Write Speed 		4940 MB/s Hugely faster peak write speed.
+196% 		1669 MB/s
4K Read
Peak 4K Random Read Speed 		84.7 MB/s Much faster peak random read.
+38% 		61.4 MB/s
4K Write
Peak 4K Random Write Speed 		315 MB/s Faster peak random write.
+25% 		252 MB/s
Mixed
Peak Sequential Mixed IO Speed 		3586 MB/s Hugely faster peak mixed IO speed.
+178% 		1292 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		113 MB/s Faster peak random mixed IO.
+28% 		88.3 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		4656 MB/s Hugely faster peak sustained write speed.
+180% 		1663 MB/s
Value & Sentiment 
+∞%
Market Share
Based on 77,451,099 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.25 % Insanely higher market share.
+∞% 		0 %
User Rating
UBM User Rating 		72 % Much more popular.
+44% 		50 %
Nice To Haves 
+118%
Age
Newest 		27 Months 16+ Months Much more recent.
+41%
DQ Read
Peak 4K-64Thread Read Speed 		2486 MB/s Hugely faster peak deep queue read.
+184% 		874 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		2073 MB/s Much faster peak deep queue write.
+71% 		1212 MB/s
AS-SSD Total
AS-SSD Total Score 		7497 Pts Hugely stronger server IO.
+124% 		3,346 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		2284 MB/s Hugely faster peak deep queue mixed IO.
+124% 		1018 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		1787 MB/s Hugely faster deep queue read.
+172% 		656 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		1382 MB/s Hugely faster deep queue write.
+118% 		634 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		1548 MB/s Hugely faster deep queue mixed IO.
+194% 		527 MB/s
Specifications 
Capacity
Capacity 		4TB 1TB
Conclusion 
Average Bench 522%
Average Bench 246%

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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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 i5-12600K $169Nvidia RTX 4060 $296WD Black SN850X M.2 2TB $135
Intel Core i5-12400F $111Nvidia RTX 4060-Ti $345WD Black SN850X M.2 1TB $80
Intel Core i5-13600K $225Nvidia RTX 4070 $500Crucial T700 M.2 4TB $350
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