Okay, update: I was able to get iPC running successfully on the machine, only thing missing is sound and video from my 9800gt. NVinject didn't work (got a "resolution not supported" message on my monitor), neither did grabbing EFI strings (?) from OSX86tools. I was able to delete NVinject, but I'm not quite sure how to reverse the latter, so I'll probably re-do the installation. Again.