So essentially, after many years I finally got enough new parts to build a new PC with a Quad Core CPU. I previously had a Core 2 Duo w/ a MSI 975x Platinum Power-Up Edition Board that I had successfully installed 10.4, 10.5,10.6, and 10.8. While using another hard drive to run windows.
Now I have:
ASUS Sabertooth P67 (rev 3.1)
Core i5 3570k
AMD Radeon HD 6970
I've come to learn that the Radeon HD 6790 is essentially not compatible with any Mac OS, which I can learn to live with. I was at least able to install a distro of Mavericks and boot into safe mode for now.
My random thought was this.. I have an older Radeon HD 4670 now laying around without a home. Could I put both in the PC and then just disable the card depending on the OS? IE. Use the newer card in windows 8 or Windows 7 on the one hard drive, and then run Mac OS and have it disable the newer incompatible card?
I tried plugging it in for kicks and giggles and was at least still able to boot in safe mode, but I don't see an easy way of disabling the problematic card short of removing it every time i want to use Mac Os which doesn't really sound great long term.
Any thoughts or suggestions? I plan on getting rid of the distro and installing as vanilla as possible again If i can find some sort of solution for the graphics card.
The only posts I found for disabling a graphics chip were from mac pro owners with the lemon units.