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WDWDS400T2X0E
▲ 500 ▼
  

Release date ≈ Q1 2015.

VS
▲ 72554 ▼

Release date: Q3 2022.

Effective Speed 
+616%
Real World Speed
Performance profile from 13,381 user samples
Benchmark your SSD here
4,609 User Benchmarks
Best Bench: 96% 421GB free
Worst Bench: 38% 61GB free (System drive)
Poor: 38% Great: 96%
SPEED RANK: 624th / 1080
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
Effective Speed
Effective SSD Speed 		72.9 % 522 % Hugely faster effective speed.
+616%
Average Score 
+666%
Read
Avg. Sequential Read Speed 		422 MB/s 3,793 MB/s Hugely faster read speed.
+799%
Write
Avg. Sequential Write Speed 		321 MB/s 3,816 MB/s Insanely faster write speed.
+1,089%
4K Read
Avg. 4K Random Read Speed 		26.6 MB/s 67.2 MB/s Hugely faster random read.
+153%
4K Write
Avg. 4K Random Write Speed 		64.8 MB/s 189 MB/s Hugely faster random write.
+192%
Mixed
Avg. Sequential Mixed IO Speed 		313 MB/s 2,970 MB/s Hugely faster mixed IO speed.
+849%
4K Mixed
Avg. 4K Random Mixed IO Speed 		24.1 MB/s 83.5 MB/s Hugely faster random mixed IO.
+246%
SusWrite
Avg. Sustained Write Speed 		235 MB/s 3,370 MB/s Insanely faster sustained write speed.
+1,334%
Peak Score 
+590%
Read
Peak Sequential Read Speed 		500 MB/s 4,696 MB/s Hugely faster peak read speed.
+839%
Write
Peak Sequential Write Speed 		440 MB/s 4,940 MB/s Insanely faster peak write speed.
+1,023%
4K Read
Peak 4K Random Read Speed 		38.8 MB/s 84.7 MB/s Hugely faster peak random read.
+118%
4K Write
Peak 4K Random Write Speed 		104 MB/s 315 MB/s Hugely faster peak random write.
+203%
Mixed
Peak Sequential Mixed IO Speed 		403 MB/s 3,586 MB/s Hugely faster peak mixed IO speed.
+790%
4K Mixed
Peak 4K Random Mixed IO Speed 		43.1 MB/s 113 MB/s Hugely faster peak random mixed IO.
+162%
SusWrite
Peak Sequential Sustained Write 60s Average 		425 MB/s 4,656 MB/s Hugely faster peak sustained write speed.
+996%
Value & Sentiment 
+297%
Market Share
Based on 77,525,378 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.06 % 0.39 % Hugely higher market share.
+550%
User Rating
UBM User Rating 		50 % 72 % Much more popular.
+44%
Nice To Haves 
+657%
Age
Newest 		116+ Months 27 Months Much more recent.
+77%
DQ Read
Peak 4K-64Thread Read Speed 		316 MB/s 2,486 MB/s Hugely faster peak deep queue read.
+687%
DQ Write
Peak 4K-64Thread Write Speed 		342 MB/s 2,073 MB/s Hugely faster peak deep queue write.
+506%
AS-SSD Total
AS-SSD Total Score 		1,114 Pts 7,497 Pts Hugely stronger server IO.
+573%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		226 MB/s 2,284 MB/s Hugely faster peak deep queue mixed IO.
+911%
ADQ Read
Avg. 4K-64Thread Read Speed 		198 MB/s 1,787 MB/s Hugely faster deep queue read.
+803%
ADQ Write
Avg. 4K-64Thread Write Speed 		259 MB/s 1,382 MB/s Hugely faster deep queue write.
+434%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		113 MB/s 1,548 MB/s Insanely faster deep queue mixed IO.
+1,270%
Specifications 
Capacity
Capacity 		512GB 4TB
Conclusion 
Average Bench 72.9%
Average Bench 522%

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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  • - CPU tests include: integer, floating and string
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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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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 Best
CPUGPUSSD
Intel Core i5-12600K $159Nvidia RTX 4060 $295WD 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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