There is a bit of controversy regarding the thermal limits of the Canon R5 and some concerns I have regarding the thermal throttling of the CFexpress cards. Right now everyone is blaming the Canon R5 for its thermal throttling but there is a little bit more to the story than what I think people realize and I want to shed some light on some other issues that could come up. In short - CFexpress cards thermal throttle when they get hot.
Choosing the right memory cards for the Canon R5 isn't cut and dry, there are two different types of memory cards that the camera can use which could introduce some limitations depending on how need to configure your system. This guide will help you find the best memory cards for the Canon R5 and covers all the nuances you'll need to know for recording video or shooting with redundancy.