I think it might be something set wrong in the bios code in regard to the LLC & voltage. The thing seems to effect several Gigabyte boards on AM4. They as I recall develop the bios for one board specific in the line-up and then transfer the code to the other ones with needed adjustments if necessary. They use varied components for power delivery, maybe the code doesn't work correct for each and every layout?
Or a setting has been set that is wrong but missed in QC & bug control?
Gigabyte X570 AORUS XTREME, Ryzen 7 3800X PBO boost, 3800/1900 MEM/FCLK, 18.104.22.168.66.tRFC 600 1T 1.700V
4x8Gb Kingston HX434C19FB2K2/16 3466C19 1.2V (Micron Rev.E 16nm [D9VPP])