SD Card Speed Guide

Comparison of SD card bus speeds^[109]
Bus interface	Bus logo	Bus speed	PCI Express lanes	Duplex	Card types				Spec version
Bus interface	Bus logo	Bus speed	PCI Express lanes	Duplex	SD	SDHC	SDXC	SDUC	Spec version
Default Speed	—	12.5 MB/s	—	?	Yes	Yes	Yes	Yes	1.01
High Speed	—	25 MB/s		?	Yes				1.10
UHS-I		50 MB/s		Half / Full	No				3.01
		104 MB/s		Half					3.01
	—	180 MB/s^[e]		Half					—
UHS-II		156 MB/s		Full					4.00
UHS-II		312 MB/s		Half					4.00
UHS-III		312 MB/s		Full					6.0
UHS-III		624 MB/s							6.0
SD Express		985 MB/s	3.1 ×1						7.0
		1,969 MB/s	3.1 ×2						8.0
		1,969 MB/s	4.0 ×1
		3,938 MB/s	4.0 ×2

Comparison of SD card Speed Class ratings^[114]
Minimum sequential writing speed	Suggested max. bitrate	Speed Class			Video format^[f]
Minimum sequential writing speed	Suggested max. bitrate	Speed Class	UHS Speed Class	Video Speed Class	SD	HD / Full HD	4K	8K
2 MB/s	15 Mbit/s	Class 2 (C2)	—	—	Yes	No	No	No
4 MB/s	30 Mbit/s	Class 4 (C4)		—		Yes	No
6 MB/s	45 Mbit/s	Class 6 (C6)		Class 6 (V6)			Yes
10 MB/s	75 Mbit/s	Class 10 (C10)	Class 1 (U1)	Class 10 (V10)
30 MB/s	220 Mbit/s		Class 3 (U3)	Class 30 (V30)				Yes
60 MB/s	460 Mbit/s			Class 60 (V60)
90 MB/s	700 Mbit/s			Class 90 (V90)


Name	Minimum random IOPS		Minimum sustained sequential writing
Name	Read	Write	Minimum sustained sequential writing
Application Performance Class 1 (A1)	1,500 IOPS	500 IOPS	10 MB/s
Application Performance Class 2 (A2)	4,000 IOPS	2,000 IOPS	10 MB/s

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