Hi. I just installed mountain lion on a P8Z68-V LX Motherbaord with an EVGA Geforce GTX 550 Ti graphics card. Dual monitors and multiple resolutions are working after I added a custom device properties string to org.chameleon.Boot.plist.
But unfortunately graphics acceleration does not seem to be working. Animations are choppy and the itunes visualizer does not display. I've tried the patches to the Geforce drivers that worked with my card in 10.7, but mountain lion does not seem to like them. Any advice is appreciated.