NVIDIA told all of its partners that it simply won’t allow the overclocking of G80 cards. It doesn’t want another Geforce 7900 GT overclocking fiasco that caused a too high return rate for the cards.

Remember, Nvidia didn’t allow anyone to overclock Geforce 7950 GX2 and they all worked at the same reference 500MHz clocks as this was what Nvidia guaranteed for these cards.

We still beleive that there is a chance that some Geforce 8800 GTX and GTS might end up a little bit faster, as some of the vendors depends on that. Maybe you can overclock the water-cooled card if anyone makes one.