I would recommend you go to the AMD CBS settings page and try out pstate OC features if you want more voltage than the max allowed from offset +0.300V...
This way you can max 1.550V and offset +0.300V if you want on your Gigabyte board. Have fun frying it though.
You can pick any voltage you like there for the p-state and use offset on top that set voltage. Try something like 1.350 and use offset for rest untill stable provided you have adequate cooling on your CPU and VRM.
Gigabyte X570 AORUS XTREME, Ryzen 7 3800X PBO boost, 2x8GB 4866/1900 18.104.22.168.90.tRFC 680 1T 1.650V [Micron Rev.J]
4x8GB 3800/1900 22.214.171.124.66.tRFC 600 1T 1.700V Kingston HX434C19FB2K2/16 3466C19 1.2V (Micron Rev.E 19nm [D9VPP]),
2x8GB Kingston HX436C17FB3K2/16 3600C17 1.35V (Micron Rev.J 17nm),
2x8GB 3866/1933 126.96.36.199.60.tRFC 448 1T 1.590V Kingston HX436C17FB3K2/16 3600C17 1.35V (Hynix DJR 17nm)