The running frequency seems to be the same on both, around 3.5 GHz on idle (weird I know). I’ll do some more testing and come back to you with the results

I can’t say anything about Proxmox or any power management tool as a fact, but I can tell you that my 1600X is running hella hot at idle on Linux. I’m dual booting and on Win it’s idle at 30° while on Linux 60°. Hope this can give some insight, or if anyone knows how to fix this pls tell