We learned that G80 Ultra is going to work at 650 MHz, at least the Dell version will, and we can confirm that we are talking about the same G80 chip just at faster GPU and memory speed. You can read more about the card here.

The card is 10.5 inches long, while the cooler is a bit longer than on the Geforce 8800 GTX cards. The Dell card runs at 2160 MHz memory at a 384 bit memory interface and this can easily be the final clock for the retail cards.

However sometimes the OEM clocks are not the same as the partners, so we will have to wait and see.