Compare: WD Black SN850X M.2 4TB WDS400T2X0E

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WDWDS400T2X0E

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Black SN850X M.2 4TB

Real World Speed

Performance profile from 8,772 user samples

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8,772 User Benchmarks

Great bench: 683% 3.5TB free
Poor bench: 288% 2.5TB free (System drive)

Poor: 288% Great: 683%

SPEED RANK: 7^th / 1080


Effective Speed Effective SSD Speed		522 %			545 %	+4%


Read Avg. Sequential Read Speed	3,793 MB/s		4,190 MB/s	Faster read speed. +10%
Write Avg. Sequential Write Speed	3,816 MB/s		4,671 MB/s	Faster write speed. +22%
4K Read Avg. 4K Random Read Speed	67.2 MB/s		87.8 MB/s	Much faster random read. +31%
4K Write Avg. 4K Random Write Speed	189 MB/s		207 MB/s	Slightly faster random write. +10%
Mixed Avg. Sequential Mixed IO Speed	2,970 MB/s		3,235 MB/s	Slightly faster mixed IO speed. +9%
4K Mixed Avg. 4K Random Mixed IO Speed	83.5 MB/s		110 MB/s	Much faster random mixed IO. +32%
SusWrite Avg. Sustained Write Speed	3,370 MB/s	Slightly faster sustained write speed. +7%	3,164 MB/s


Read Peak Sequential Read Speed	4,696 MB/s		5,940 MB/s	Faster peak read speed. +26%
Write Peak Sequential Write Speed	4,940 MB/s		6,437 MB/s	Much faster peak write speed. +30%
4K Read Peak 4K Random Read Speed	84.7 MB/s		189 MB/s	Hugely faster peak random read. +123%
4K Write Peak 4K Random Write Speed	315 MB/s		378 MB/s	Faster peak random write. +20%
Mixed Peak Sequential Mixed IO Speed	3,586 MB/s		4,683 MB/s	Much faster peak mixed IO speed. +31%
4K Mixed Peak 4K Random Mixed IO Speed	113 MB/s		218 MB/s	Hugely faster peak random mixed IO. +93%
SusWrite Peak Sequential Sustained Write 60s Average	4,656 MB/s	+2%	4,580 MB/s

Market Share

Based on 77,603,115 SSDs tested

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User Rating UBM User Rating	72 %	Slightly more popular. +5%	68.4 %
Market Share Market Share (trailing 30 days)	0.2 %		0.54 %	Hugely higher market share. +170%
Price Price (score)	$250		186 USD	Much cheaper. +35%
Value Value For Money	272 %	Better value. +19%	228 %


DQ Read Peak 4K-64Thread Read Speed	2,486 MB/s	Slightly faster peak deep queue read. +7%	2,321 MB/s
DQ Write Peak 4K-64Thread Write Speed	2,073 MB/s	Slightly faster peak deep queue write. +9%	1,899 MB/s
DQ Mixed Peak 4K-64Thread Mixed IO Speed	2,284 MB/s	Slightly faster peak deep queue mixed IO. +9%	2,100 MB/s
ADQ Read Avg. 4K-64Thread Read Speed	1,787 MB/s	+4%	1,711 MB/s
ADQ Write Avg. 4K-64Thread Write Speed	1,382 MB/s	Faster deep queue write. +10%	1,255 MB/s
ADQ Mixed Avg. 4K-64Thread Mixed IO Speed	1,548 MB/s	+4%	1,484 MB/s
Age Newest	27 Months		19.4 Months	Much more recent. +39%
AS-SSD Total AS-SSD Total Score	7,497 Pts		7,696 Pts	+3%


Capacity Capacity			4TB			—

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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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]

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CPU	GPU	SSD
Intel Core i5-13600K $210	Nvidia RTX 4060 $285	WD Black SN850X M.2 2TB $125
Intel Core i5-12600K $160	Nvidia RTX 4060-Ti $389	WD Black SN850X M.2 1TB $80
Intel Core i5-12400F $111	Nvidia RTX 4070 $500	Crucial T700 M.2 4TB $330