GTAV works better with AMDVLK, as one of the very few games out there. You could give that a shot, but be aware that AMDVLK often gets selected as default, so having AMD_VULKAN_ICD=RADV
in your global Env. Variables are a good idea.
And then launching GTAV with AMD_VULKAN_ICD=AMDVLK %command%
.
This is part of the motherboard and can only be changed with specific tools from the manufacturer. Back in the days there was
AMIDEDOS
as a dos tool to change it in AMI Bios. You would need to find out, what tool can be used to change it in your UEFI. However, it's possible that those tools are not available to the public.