Built my PC over 3 years ago with an Asus P4P800 mobo - I have had the CPU oc'd to 3.2Ghz from 2.8Ghz since the day I built it - still runs well - no overheating problems etc. Love Asus's OC utility... If your gonna oc you definately should invest in a new heatsink and fan though as someone said earlier. OCing w/ the stock fan can get the job done but is it really worth clinging to a 15$ heatsink/fan when you can drop $30-$45 and save a $200 investment..?