I know the 6800 ultra is an excelent card but I have heard about overclocking cards. Now, can either be overclocked or just the 6800GT? If only the GT can be overclocked will it be better than the ultra?
On paper the 6800 GT and Ultra are virtually the same card, the only noticable difference being the core clock and memory speeds. But, as Trifid said certain GT's can indeed be overclocked beyond Ultra speeds. Some manufacturers overclock their GT's from stock (eg BFG).