This Guy Watercooled His Canon R5 and Unlocked Unlimited 8K - PetaPixel
He found that the camera’s main processor is the culprit that generates a great deal of heat during recording and that the thermal pads covering the processor don’t seem to be positioned very well.
The copper plate alone provides 39 minutes of recording at room temperature, the addition of a base-mounted fan provides unlimited recording at room temperature, and the addition of the rear-mounted heat sink provides unlimited recording at higher ambient temperatures.“We’re left with a camera that not only has much improved 8K video record times but one that can be paired with some simple homemade attachments that allow it to reliably record in this mode for an unlimited length of time, making it a truly unique video creation tool,” Matt says.Matt also believes that Canon could have designed the camera to dump the heat toward the bottom of the camera and then sold a separate base attachment for videographers that provides vastly extended recording times.