your not going to be doing any good if the case is hot. you need the fan to be moving fresh air across the northbridge. And as far as installing a fan on the northbridge, just find one that fits and screw that puppy on, I did. But like Dulanic said, it wont get you any more fsb, at least it didnt for me. 107 is tops, but i run it at 105 anyways, so i dont really care.