I read an article from some hardcore OCing guru and he stated that when NV 7800 cards are instaled, putting the buss speed to 110 increases performance.
I run 3dmark (05 iirc) with it at 100 and then 110 and the there was a slight performance boost, about 150 i think. Ive had it set at 110 for a month now and stability hasnt suffered.