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WDWDS400T2X0E
IntelSSDSC2KW256G8
▲ 72554 ▼

Release date: Q3 2022.

VS
▲ 5125 ▼

Release date ≈ Q2 2017.

Effective Speed 
+447%
Real World Speed
Performance profile from 26,204 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
17,432 User Benchmarks
Best Bench: 117% 51GB free
Worst Bench: 67% 22GB free (System drive)
Poor: 67% Great: 117%
SPEED RANK: 285th / 1080
Effective Speed
Effective SSD Speed 		522 % Hugely faster effective speed.
+447% 		95.5 %
Average Score 
+554%
Read
Avg. Sequential Read Speed 		3,793 MB/s Hugely faster read speed.
+707% 		470 MB/s
Write
Avg. Sequential Write Speed 		3,816 MB/s Hugely faster write speed.
+869% 		394 MB/s
4K Read
Avg. 4K Random Read Speed 		67.2 MB/s Hugely faster random read.
+80% 		37.3 MB/s
4K Write
Avg. 4K Random Write Speed 		189 MB/s Hugely faster random write.
+136% 		80 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		2,970 MB/s Hugely faster mixed IO speed.
+694% 		374 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		83.5 MB/s Much faster random mixed IO.
+75% 		47.8 MB/s
SusWrite
Avg. Sustained Write Speed 		3,370 MB/s Insanely faster sustained write speed.
+1,316% 		238 MB/s
Peak Score 
+618%
Read
Peak Sequential Read Speed 		4,696 MB/s Hugely faster peak read speed.
+814% 		514 MB/s
Write
Peak Sequential Write Speed 		4,940 MB/s Hugely faster peak write speed.
+958% 		467 MB/s
4K Read
Peak 4K Random Read Speed 		84.7 MB/s Much faster peak random read.
+71% 		49.4 MB/s
4K Write
Peak 4K Random Write Speed 		315 MB/s Hugely faster peak random write.
+181% 		112 MB/s
Mixed
Peak Sequential Mixed IO Speed 		3,586 MB/s Hugely faster peak mixed IO speed.
+685% 		457 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		113 MB/s Much faster peak random mixed IO.
+73% 		65.3 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		4,656 MB/s Insanely faster peak sustained write speed.
+1,545% 		283 MB/s
Value & Sentiment 
+547%
Market Share
Based on 77,548,752 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.18 % Hugely higher market share.
+800% 		0.02 %
Value
Value For Money 		250 % Insanely better value.
+1,420% 		16.5 %
User Rating
UBM User Rating 		72 % Much more popular.
+41% 		51 %
Price
Price (score) 		$279 $70 Much cheaper.
+75%
Nice To Haves 
+528%
Age
Newest 		27 Months Much more recent.
+69% 		88+ Months
DQ Read
Peak 4K-64Thread Read Speed 		2,486 MB/s Hugely faster peak deep queue read.
+705% 		309 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		2,073 MB/s Hugely faster peak deep queue write.
+484% 		355 MB/s
AS-SSD Total
AS-SSD Total Score 		7,497 Pts Hugely stronger server IO.
+551% 		1,151 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		2,284 MB/s Hugely faster peak deep queue mixed IO.
+814% 		250 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		1,787 MB/s Hugely faster deep queue read.
+527% 		285 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		1,382 MB/s Hugely faster deep queue write.
+414% 		269 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		1,548 MB/s Hugely faster deep queue mixed IO.
+663% 		203 MB/s
Specifications 
Capacity
Capacity 		4TB 256GB
Conclusion 
Average Bench 522%
Average Bench 95.5%

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]

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8,772
17,432
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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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  • - RAM tests include: single/multi core bandwidth and latency
  • - SkillBench (space shooter) tests user input accuracy
  • - Reports are generated and presented on userbenchmark.com
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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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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 i5-13600K $210Nvidia RTX 4060 $280WD 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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