I have this:
Gigabyte AMD Radeon HD 7850 2 GB GDDR5 DVI-I/HDMI/2x mini-Displayport PCI-Express 3.0 Graphic Card GV-R785OC-2GD
Download the kext created by hazemhazoom and run KextBeast. It found the card in Slot 1, but will not boot all the way to the desktop. Can any one else confirm if this card is working or not? No joy for me. I went back to my ATI HD 5850 which is working fine.
This kext might not work with your card as hazeemhazoom has a Sapphire Branded card...
The kext that you downloaded and installed them using kextbeast is a kext that I edited and hacked before
I did that as you without changing anything in the kexts just install them using Kextbeast.I used the Sleep trick and it Worked!I am using I7 3770k with HD4000 set as primary on Asus P8Z77-V, XFX 7850 DD Edition,32gb Corsair. ML 10.8.3