The one I am intending to keep, also the one that's installed right now, Sapphire Pulse Vega 56, behaves fine, when it comes to thermals, I don't see my CPU having higher temps than usual and the NVMe currently is around 40C degrees. I wasn't looking at NVMe temps before, so I can't relate here.
However, the issue is back again, and with it the console errors about 'Failed HDCP: status 4'. I've ordered new cables, but don't have them yet, so can't say if it's fixable. But it is very strange that it was gone and is back in the morning