Try and plug your dvi cable into your 7770 and then bootup your pc and then get into osx blind. I think you should just have to press enter to start your bootloader. once osx starts your 7770 might take over and start working. worth a shot
I wanted to share my benchmarks with the sapphire 7950 3gb Ven 0x1002 Dev 0x679a
I am only using fakesmc and cloverbootloader, everything else is vanilla.
http://i.imgur.com/VCYWhh5.png
You can compare them here, its about the same as an gtx 680 on windows, impressive...
I went and bought a 7950 from sapphire just because i saw that sapphire are making a mac version of it. I got the 3gb version.
I use a asus p8h61-i with patched bios
I got my 7950 to work like this
-Installed fresh ML
-updated to 10.8.3
-installed clover bootloader
-changed my uefi...
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