Hello Gmint, Hardware is a Mac Pro 1,1, (Dual core 3.0 Xenon, Radeon HD5770, NVIDIA GForce 8800GT, and one other card which I can't recall right now) w/ 12 Gigs of RAM running 10.7.4. mixing various types of GPU is not recommended (ATI + nVIDIA + ... in your case) as their OpenGL driver does not coo...