[rockthegod]

6600 GT
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Core Clock: 500 MHz
Memory Clock: 1000 MHz
Memory: GDDR3
Mem. subsystem: 128 bit
Pixel Pipelines: 8

6800 Plain/Non Ultra
=================
Core Clock: 375 MHz
Memory Clock: 700 MHz
Memory: DDR
Mem. subsystem: 256 bit
Pixel Pipelines: 12

Thus u see, with this specifications 6600GT will run games better at medium to high resolutions WITHOUT AA/AF turned on.

But once AA/AF is turned on 6800 Plain/Non Ultra will show better performance over 6600GT.

But 6600GT is priced lower than 6800 plain/NonUltra and for hardcore gamers 6600GT gives the BEST BANG FOR THE BUCK.