Since some believe this is the card that comes with the new iMac (and it seems to be true) then here's the link for all those interested in it's performance and for those that say it's 'slightly' better than the 2600...
http://www.notebookcheck.net/NVIDIA-GeForce-8800M-GTS.6934.0.html
http://www.notebookcheck.net/NVIDIA-GeForce-8800M-GTS.6934.0.html