Barefeats speed test the EVGA NVIDIA Geforce GTX 680 Mac Edition and it is good!
Barefeats has some speed tests and things are looking good for gaming, though I would like to see some Premiere Pro and After Effects Speed tests (especially with the Quadro 5000K in the tests).
Now if only Apple would allow more than 2GB of RAM (yes I know the QUADRO 5000K has 4GB of RAM, but you still have to hack your mac to get a PC NVIDIA card to run that has more than 2GB of RAM).