I have the same issue with the Dark Hero but even worse.
With the a Asus Strix 970 GTX in the 1st (upper) PCIE Slot, the PCH temperature is 95-98Ãƒâ€šÃ‚Â° when idle.
With the card in the 2nd (lower) PCIE slot the PCH temp is 62 - 66 Ãƒâ€šÃ‚Â°C.
I think that is way to high.
I have a Ryzen 9 5950X, 2x16 GB GSkill 3600 MHz Ram, 2 x Samsung 980Pro m.2, 360mm AIO and 5 case fans
Bios all Stock settings, except the DOCP Ram Profile.
I have no idea what to do since others have way lower temperatures.
I changed the chipset and VRM thermal pad to laird hd 90000 (1.5mm & 2mm) and waited around 30 mins for the temperature to stable, it was around 56 degree celsius (chipeset) while VRM is 47 degree celsius then using CinebenchR23 to run for 10 mins and the temperature become around 57 (chipset) while VRM is 55. Then played CSGO for around 1 hour and the chipset rose to 65 degree celsius while VRM rose to 56 degree celsius