u need a fan! and thats final! fanless just means that you dont have to put a fan directly on the heatsink. but what happens when the heatsink is vry hot and has no way of cooling down? then ur f***ed. get at least a single if not two 120mm fans for your case, for air in and air out. and the cpu isnt the only part that makes alot of heat. there is the chipset, other crap on the mobo such as power stuff, the hdd, vid card, dvd rom, etc.