With Thunderbolt disabled I start off fairly cool at 60-63C but still reach 70C after the system's been under some load...
Does your GPU have a 0-rpm mode ? If so, disable it and set its fan to 30-35% (should still be silent) in order to create some airflow around the PCH.
After checking internally, the ROG MAXIMUS XIII HERO's PCH temperature is in normal operating temperature. The maximum heat dissipation is 108C.
Even though the device is idling, the system is still running, so an amount of heat would still be generated and you still see a certain temperature of your PCH.
I appreciate your feedback.
Thanks a lot for the info, Thomas. Intel releases a document called Thermal Mechanical Specifications and Design Guidelines (TMSDG) for the chipsets, but I couldn't find one for Z590 yet (all the few previous chipsets seem to have a Tj,max of 108C, too).
Could you please confirm the Tj,max for AMD's X570 chipset, if possible?