So V30 is 30MB x8= 240 Mbps.So it should handle My IPB 4k 50fps light format in Canon R6 mk II. I wont use CLog3 so V60card would be an overlill for me. Am I right?
Yes, a v30 would be enough for you, but it is never good to go to the limit, since if for some reason the reading has a low peak, it could drop frames or even corrupt the file. That's why it's always better to go with a higher class (V60 in your case)