Can't boot with R9 280x enabled. Only integrated graphics boots.

I installed OSX on my pc with Unibeast and Multibeast and it works like a charm on integrated graphics. But the problem is that i can't get it to boot with my R9 280x enabled.. It gives me this error when booting with my 280x (on -v): http://i.imgur.com/LVboNFF.jpg

It can boot into safe mode (-x), but not without. If i try, it will get stuck a little under half way... I have tried to boot with almost all flags, without success..

Is it possible to get my XFX R9 280X to work?

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Relevant specs: Asrock B75M-DGS R2.0 (All default settings) i5-3570k XFX R9 280x 120gb HyperX SSD

submitted by TheDisarmed

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What is missing? Please comment to help!

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