I am trying to use a 2.5 gig GTX 570 in my Mac Pro 5,1 with OS 10.8. I read that OS 10.8 doesn't see more than 1 gig of VRAM. I am a video editor so I need OCL as well as the VRAM for FCPX. So, After attempting to do the Netkas fix for greater than 2 gigs VRAM and changing the library file in GeForceGLDriver.Bundle my system will not boot. Please would some caring soul running 10.8 could send me the unchanged files I would be so ever grateful. I just got 10.8 installed with all my apps and Win 7 with Boot Camp when this happened. I hope I won't have to repeat the process. I am pleading for help!