According to an old thread, it seems the PCH temp reading from Nuvoton shouldn't exist anymore because it's incorrect:
Right now in the latest version, it shows 81C for the PCH, whereas the ASUS EC reading shows 65C.
Found a link to this thread in Reddit. I’m running a 5950X + C8F (AGESA 18.104.22.168) + RTX 3090, all fully stock (3200MHz memory, >16 full passes of memtest), and got a WHEA 18 today after running HWiNFO for a while. Was having quite a few of them in January as well, and, most times that I remember...