@BrodieOnLinux >Do you install microcode updates onto your system?
I don't - at the moment I'm on a Librebooted-libre KGPE-D16 with 2 Opetron 62XX CPU's, which I haven't loaded any proprietary malware onto.

It seems that the microcode signing scheme of this CPU line may be flawed - which is a good thing, as such would allow for free microcode updates (although those don't seem to be actually necessary, as AMD seemed to have previously made sure server CPU's worked out of the box).