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, 3800/1900 MEM/FCLK, 126.96.36.199.66.tRFC 600 1T 1.700V
4x8Gb Kingston HX434C19FB2K2/16 3466C19 1.2V (Micron Rev.E 19nm [D9VPP])