The easiest over clock is 558MHz with a FBS of 124Mhz if your RAM will make the trip. Set you AGP to 2/3 and disable speed error hold. You pherphials normally run better at the semi-std bus speed. Cooling even with the factory heat sink is adequate and the default voltage of 2.0V should work most times. The 450 normally runs warm but unless really push will not lock up on you.