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WDWDS400T2X0E
AdataASX8200PNP-512GT-C
▲ 72554 ▼

Release date: Q3 2022.

VS
▲ 58335 ▼

Release date ≈ Q4 2018.

Effective Speed 
+116%
Real World Speed
Performance profile from 82,956 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
74,184 User Benchmarks
Best Bench: 311% 308GB free (System drive)
Worst Bench: 147% 402GB free (System drive)
Poor: 147% Great: 311%
SPEED RANK: 70th / 1080
Effective Speed
Effective SSD Speed 		522 % Hugely faster effective speed.
+116% 		242 %
Average Score 
+142%
Read
Avg. Sequential Read Speed 		3,793 MB/s Much faster read speed.
+67% 		2,265 MB/s
Write
Avg. Sequential Write Speed 		3,816 MB/s Hugely faster write speed.
+155% 		1,494 MB/s
4K Read
Avg. 4K Random Read Speed 		67.2 MB/s Faster random read.
+27% 		53.1 MB/s
4K Write
Avg. 4K Random Write Speed 		189 MB/s Faster random write.
+29% 		146 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		2,970 MB/s Hugely faster mixed IO speed.
+213% 		948 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		83.5 MB/s Faster random mixed IO.
+13% 		74.2 MB/s
SusWrite
Avg. Sustained Write Speed 		3,370 MB/s Hugely faster sustained write speed.
+487% 		574 MB/s
Peak Score 
+98%
Read
Peak Sequential Read Speed 		4,696 MB/s Much faster peak read speed.
+70% 		2,763 MB/s
Write
Peak Sequential Write Speed 		4,940 MB/s Hugely faster peak write speed.
+136% 		2,097 MB/s
4K Read
Peak 4K Random Read Speed 		84.7 MB/s Faster peak random read.
+20% 		70.7 MB/s
4K Write
Peak 4K Random Write Speed 		315 MB/s Much faster peak random write.
+32% 		238 MB/s
Mixed
Peak Sequential Mixed IO Speed 		3,586 MB/s Hugely faster peak mixed IO speed.
+123% 		1,606 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		113 MB/s Faster peak random mixed IO.
+11% 		102 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		4,656 MB/s Hugely faster peak sustained write speed.
+294% 		1,183 MB/s
Value & Sentiment 
+70%
Market Share
Based on 77,495,229 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.25 % Hugely higher market share.
+92% 		0.13 %
Value
Value For Money 		260 % Hugely better value.
+238% 		76.8 %
User Rating
UBM User Rating 		72 % More popular.
+24% 		58 %
Price
Price (score) 		$265 $62 Much cheaper.
+77%
Nice To Haves 
+120%
Age
Newest 		27 Months Much more recent.
+62% 		71+ Months
DQ Read
Peak 4K-64Thread Read Speed 		2,486 MB/s Much faster peak deep queue read.
+78% 		1,399 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		2,073 MB/s Much faster peak deep queue write.
+65% 		1,258 MB/s
AS-SSD Total
AS-SSD Total Score 		7,497 Pts Much stronger server IO.
+73% 		4,327 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		2,284 MB/s Hugely faster peak deep queue mixed IO.
+285% 		593 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		1,787 MB/s Hugely faster deep queue read.
+95% 		915 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		1,382 MB/s Much faster deep queue write.
+75% 		790 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		1,548 MB/s Hugely faster deep queue mixed IO.
+225% 		476 MB/s
Specifications 
Capacity
Capacity 		4TB 512GB
Conclusion 
Average Bench 522%
Average Bench 242%

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

Offered pretty much best performance and capacity at price of 80 USD currently. If you want both NVMe R/W speeds as well as high capacity storage at low price, this thing is a must buy! [Feb '20 ColdSpy]

MORE DETAILS

User Builds 
8,772
74,184
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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.
How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute

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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  • - Download and run UserBenchmark
  • - CPU tests include: integer, floating and string
  • - GPU tests include: six 3D game simulations
  • - Drive tests include: read, write, sustained write and mixed IO
  • - 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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  • - See speed test results from other users
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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 200+ trustpilot reviews are mostly written by virgin marketing accounts. Real users don't give a monkey's about big brands.
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Instead of pursuing brands for sponsorship, we've spent 13 years publishing real-world data for users.
The Best
CPUGPUSSD
Intel Core i5-12600K $159Nvidia RTX 4060 $270WD Black SN850X M.2 2TB $135
Intel Core i5-12400F $110Nvidia RTX 4060-Ti $380WD Black SN850X M.2 1TB $75
Intel Core i5-13600K $210Nvidia RTX 4070 $500Crucial T700 M.2 4TB $350
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