I just got my p4 2.26B and asus p4b-533e, power supply should be in later today. I will be overclocking but not to extreme, which artic compound should I get, and are either really necessary, also how do they affect the warranty (I know overclocking technically voids it, but if I don?t raise the voltage to high (will go no higher then 1.65) I doubt I will burn the chip up so they wont know that I overclocked)? Thanks.