With the new 90nm cores the stock coolign keeps them really cool. I do suggest if you dont have an intake or exhausst fans, to get one of each for optimal circulation in the case. RIght now i ahve mine up to 2.2 on stock and it runs low 40s easily, I will eb gettign it up to 2.5 and will fin dout how much more heat it gives but im sure it will be fine.