So my IP35 pro is topping out at about 454fsb with my X3350. I've got the NB at 1.52v, can I go higher than that or should that be about my max for 24/7?

Also, I've currently got 60mm fan blowing over the NB, and the PWM is passive and getting to about 60C with 1.35vcore loaded at 100%, should I think about a fan over the PWM at 60C?