Gigabyte GA-970a-UD3 v1.2 config and make.conf for Gentoo
KernelConfig-4.19-GA970a-ud3-1.2
Just saving here so I don’t lose it again and maybe help someone out.
Also, on this motherboard, you can use UEFI, but it has Hybrid EFI and you have to create /boot/EFI/boot/bootx64.efi or else it doesn’t work.