I only have one fan in my entire system, and that's the medium sized HSF on my K6-III+. If I stick my hand inside, it's a little bit warm. So I guess that's around 30, no higher than 40. What makes all the heat is the Banshee - it gets hot, not overclocked, and there's no fan on that. What makes more heat than anything else is my monitor though, that heats up my whole room!