Amd Powerplay. The released amd memory tweak tool has turned into a pretty useful alternative to modding the bios. Now i was having some issues with windows, so i reset everything.
If you want to use it on a real mac (egpu or mac pro) you can use a dummy kext to inject the powerplay table. If your system is not running windows 7 or 10, or for drivers/software for other amd. > 0x00000006 response 0xffffffc2 > amdgpu: