Guess you've never heard the 680i board donket, that lil chipset fan is a screamer. In one review they did run the 780i without the fan up to around 450fsb. After that it was needed, also seemed to be needed if running sli. Here is the review, well more of an overview.
Luckily though I still can look around at the chipsets from intel since they have really seemed to step it up a notch.