Today I finally got El Capitan working on my Mac Pro 1,1. However, everything is flickering and I can't figure out why. When I load up system information, it says 8MB VRAM instead of the 256MB VRAM it normally has. I would normally install a driver on Windows, but on OS X I'm kind of new to this "3rd party" stuff. I know kexts and so on, but I have no idea if finding the right one would work or anything like that. Anyone know what's up? It looks like it's only hardware accelerated apps, but same issue even if I turn hardware acceleration off. Any help is highly appreciated! Thanks.