Hi! I have installed 10.10 to my p8z77--i3570k--sapphire hd7850 1gb and already updated to 10.10.1. Everything works great, but still have one thing - my graphics is not flawless, got some awful lags/glitchs when resizing or moving windows and optimizing size by pressing "+". In system 7850 recognized as "Ati 7xxx 1024MB" and QE/CI fully working. I'm using chimera/chameleon bootloader. In boot config is only GraphicEnabler=no.
Can you confirm that you dont have this issues, and I do something wrong before/during installation?