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.
NVIDIA won't allow GeForce 8800 overclocking
Posted on Friday, Oct 20 2006 @ 18:25 CEST by Thomas De Maesschalck