I successfully installed Yosemite on my PC with following specs:
Mainboard: ASUS M5A99FX Pro 2.0
CPU: AMD FX 8350
Grafik: Asus Radeon HD7870-DC2-2GD5-V2
I Used amd64 and npci=0x2000 for install
After install i got gray screen.
I backed up all graphic kexts and it worked.
Installed Multibeast with DSDT Free
Reinstallen AMDSupport.kext, AMD7000....kext
after that i have to boot with npci=0x2000 and PCIRootUID=1.
screen resolution works (1920x1080) but the screen flickers at most apps e.g. notes, Google chrome
I tried GraphicsEnabler=Yes/No
second problem is when i install clover (UEFI version) i can't use my keyboard and mouse after choosing my hdd.
sry for this English
Ok no Problems left all works perfect
can be closed