G71, Geforce 7900 GTX needs to hit 700 MHz+
 

A SOURCE who understands the graphic marchitecture and the manufacturing process have confirmed that Nvidia needs to clock its G71 to very high frequency to match ATIs X1900 XTX flagship offering.
ATI is happily shipping its R580, Radeon X1900 generation cards where the fastest are running at 650 MHz, and it is not running cool. ATI managed to ship some of the X1800 based cards running at 700 MHz out of the box but it could not ship tens of thousands of those.