Dont know....
But im pretty sure u can find some where online to get a better graphics card that would ship online.... if you dont i would jus go to the nearest BEST BUY or any other computer store out there..
I would think that the 6800 would be faster... not sure (like every 1 else)
i have 6600 vanilla and i play all games without any problem
anyway it is better for u to get 6600GT because it is better than both and it just costs 100$.
i got the x1300pro and it plays quake 4 on 1024x768 high settings and its pritty smooth, only a little bit lag but 1gig should do the trick. Thnx for the info guys