SD Card Speed Overview

SD SDHC SDXC SDXC-II SDUC(SDXC more than 32 GB, SDUC more than 2TB)

Min sequential write speed	Speedclass	UHS class	V class
90 MB/s			V90
60 MB/s			V60
30 MB/s		U 3	V30
10 MB/s	C 10	U 1	V10
6 MB/s	C 6		V6
4 MB/s	C 4
2 MB/s	C 2
The results may vary by load/usb connection and card reader. Based on manufacturer information.

SDXC Cards for professional DSLR

for photography like Canon EOS 60D, which achieves a maximum write rate of 21(-28)MB/s. Especially on continious shots by mount of 6 in RAW there have to be a fast card. So it suffices as a SanDisk Extreme SDXC UHS-I V30 U3 C10. suggested card is the SanDisk Extreme Pro with 95MB/s write speed. These following cards i defenitly would buy by myself.
SanDisk, Kingston, PNY, Transcend, Sabrent, Lexar, Samsung

Model	SanDisk Extreme Pro UHS-I V30 U3	Lexar E Series SDXC UHS-I U3 V30 C10	Lexar High-Performance 800x UHS-I BLUE Series	Kingston 128GB SDXC Canvas Go Plus 170R C10 UHS-I U3 V30	PNY 128GB EliteX-PRO60 Class 10 U3 V60 UHS-II	Transcend TS128GSDC330S	SABRENT SD-TL60-128GB C10 UHS-II V60
pricing €	20	20	24	20	31	24	35
speed	r 200 MB/s w 90 MB/s	r 120 MB/s w 45 MB/s	r 120 MB/s w 45 MB/s	r 170 MB/s w 90 MB/s	r 280 MB/s w 100 MB/s	r 100 MB/s w 85 MB/s	r 270 MB/s w 170 MB/s
capacity	128 gb
external link (amazon)
ranking	best card			pricing winner	performance winner
The results may vary by load and mainboard connection. Based on manufacturer information.

Model	Samsung Pro Plus UHS-I V30 U3	Lexar Professional 1066x Silver Series SDXC UHS-I U3 V30 C10	Angelbird AV PRO UHS-II 128GB V60
pricing €	22	30	80
speed	r 160 MB/s w 120 MB/s	r 160 MB/s w 120 MB/s	r 280 MB/s w 160 MB/s
capacity	128 gb
external link (amazon)
ranking
The results may vary by load and mainboard connection. Based on manufacturer information.