What do you mean by diagnostic? If you mean benchmarking, there are programs like 3dmark01, 3dmark03, aquamark, etc that will benchmark your video card and your system. If you mean a program that will give you info about your card, then I suggest looking at the ati control panel or sisoft sandra will give you info about your system too. If you are looking for a program to diagnose a problem with you video card, then I'm not so sure. Diagnosing a problem may entail using many programs and configurations. Hope that helps.