The eVGA 7900GTX 512MB Superclock version came factory overclocked at 690MHz and 1760MHz memory.
Its quite possible to stably overclock a 7900GTX to over 700MHz / 1850MHz, but watch your temps. If you want to get a good overclock, use an aftermarket cooler, I think Zalman makes a nice cooler for the 7900GTX, as does Thermalright.
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