The first R600 silicon is clocked slower then the final card and is out there just to fiddle with and shows the projected performance to help game developers to debug their games and get it ready for the new marchitecture.
This gets us back to September when Nvidia already had lower clocked G80 chips for its Special, VIP chaps.
ATI/AMD can just sit and cry on a graphic end as they don't have anything to fight super cool G80 for at least next three months. Interesting timing for a beta GPU isn't it? ยต