i have 4 fans in my computer total. i have the cpu, power supply, side fan, and back fan. the side, back, and power supply are all pushing air out of my system. i have an athlon 1800+ t-bred running at 2ghz. right now it's at 40 C and about 44 under load. when my room cools off a little it will go down to about 34 under load, so it depends alot on the temp of your room.