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WDWDS400T2X0E
SamsungMZ-V6P512BW
▲ 72552 ▼

Release date: Q3 2022.

VS
Effective Speed 
+96%
Real World Speed
Performance profile from 72,292 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
63,520 User Benchmarks
Best Bench: 353% 383GB free
Worst Bench: 159% 72GB free (System drive)
Poor: 159% Great: 353%
SPEED RANK: 57th / 1080
Effective Speed
Effective SSD Speed 		522 % Hugely faster effective speed.
+96% 		266 %
Average Score 
+120%
Read
Avg. Sequential Read Speed 		3793 MB/s Hugely faster read speed.
+88% 		2013 MB/s
Write
Avg. Sequential Write Speed 		3816 MB/s Hugely faster write speed.
+181% 		1359 MB/s
4K Read
Avg. 4K Random Read Speed 		67.2 MB/s Much faster random read.
+44% 		46.7 MB/s
4K Write
Avg. 4K Random Write Speed 		189 MB/s Much faster random write.
+43% 		132 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		2970 MB/s Hugely faster mixed IO speed.
+272% 		799 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		83.5 MB/s Much faster random mixed IO.
+34% 		62.3 MB/s
SusWrite
Avg. Sustained Write Speed 		3370 MB/s Hugely faster sustained write speed.
+176% 		1222 MB/s
Peak Score 
+112%
Read
Peak Sequential Read Speed 		4696 MB/s Hugely faster peak read speed.
+81% 		2601 MB/s
Write
Peak Sequential Write Speed 		4940 MB/s Hugely faster peak write speed.
+157% 		1921 MB/s
4K Read
Peak 4K Random Read Speed 		84.7 MB/s Much faster peak random read.
+53% 		55.5 MB/s
4K Write
Peak 4K Random Write Speed 		315 MB/s Much faster peak random write.
+51% 		208 MB/s
Mixed
Peak Sequential Mixed IO Speed 		3586 MB/s Hugely faster peak mixed IO speed.
+260% 		995 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		113 MB/s Much faster peak random mixed IO.
+41% 		80.1 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		4656 MB/s Hugely faster peak sustained write speed.
+143% 		1915 MB/s
Value & Sentiment 
+162%
Market Share
Based on 76,882,556 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.19 % Hugely higher market share.
+280% 		0.05 %
Value
Value For Money 		241 % Hugely better value.
+392% 		49 %
User Rating
UBM User Rating 		72 % Much more popular.
+31% 		55 %
Price
Price (score) 		$293 $128 Much cheaper.
+56%
Nice To Haves 
+75%
Age
Newest 		25 Months Much more recent.
+73% 		94+ Months
DQ Read
Peak 4K-64Thread Read Speed 		2486 MB/s Hugely faster peak deep queue read.
+89% 		1318 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		2073 MB/s Much faster peak deep queue write.
+56% 		1327 MB/s
AS-SSD Total
AS-SSD Total Score 		7497 Pts Much stronger server IO.
+80% 		4,171 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		2284 MB/s Hugely faster peak deep queue mixed IO.
+100% 		1142 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		1787 MB/s Much faster deep queue read.
+61% 		1107 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		1382 MB/s Much faster deep queue write.
+62% 		852 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		1548 MB/s Much faster deep queue mixed IO.
+76% 		881 MB/s
Specifications 
Capacity
Capacity 		4TB 512GB
Conclusion 
Average Bench 522%
Average Bench 266%

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

Samsung’s NVMe SSD flagship, the 960 Pro, is one of the fastest consumer SSDs on the market, currently second only to Intel’s 900P Optane SSDs. This PCIe SSD offers high-end performance at a premium price and therefore, as the name suggests, is may be more suited towards professional users. Our real world benchmarks show that the 960 Pro has read/write speeds in excess of 4 times faster than the Samsung 850 Pro which is the next best SATA SSD. Compared to the now two year old NVMe 950 Pro the 960 Pro offers significantly higher write throughput and is less susceptible to thermal throttling. The 960 Pro is based on a denser version of Samsung’s V-NAND (3D) technology, featuring more layers of memory cells. The 960 Pro also features an upgraded and faster 5 ARM Polaris controller, compared to the 950 Pro’s 3 ARM UBX controller. The smallest capacity for the 960 Pro is 512 GB, which may make it prohibitively expensive for some. Fortunately, for those that still want the superb NVMe performance, the 250 GB Samsung 960 Evo offers a more affordable choice, albeit with lower sustained write speeds when compared to the 512 GB 960 Pro. The 960 Pro is based on MLC (2-bit) V-NAND whilst the 960 Evo is based on the slightly lower enduring TLC (3-bit) V-NAND, and this accounts for Samsung’s reduced warranty for the 960 Evo (3 years/200 TBW versus 5 years/400 TBW for the 512 GB versions of the 960 Evo and 960 Pro respectively). Unlike the 960 Evo, the 960 Pro doesn’t have an SLC cache which results in more consistent sustained write speeds. [Nov '17 SSDrivePro]

MORE DETAILS

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Solid State Drive Rankings (Price vs Performance) September 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?
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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?
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The Best
CPUGPUSSD
Intel Core i5-12600K $169Nvidia RTX 4060 $299WD Black SN850X M.2 2TB $146
Intel Core i5-12400F $112Nvidia RTX 4060-Ti $379WD Black SN850X M.2 1TB $80
Intel Core i5-13600K $219Nvidia RTX 4070 $278Crucial T700 M.2 4TB $406
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