The GameWizard is unsupported under OSX so you just get pass-through with no acceleration. Also, it only accelerates voodoo II savvy games with zero effect on normal 2D display activities. It's benefits are "limited". Overall performance boost would better be achieved with maxxing out the ram and putting in a faster hard-drive. I do have two of them somewhere but opted for putting in a Harmoni and a Griffin iPort rather than the GameWizard.