You can OC the processor to whatever speed you want by using the wire socket mod, which is easy to do and can be found by googling for it. As far as heat goes, a 35 watt mobile should produce less heat than your old one to begin with, so you do have some room to play with even in a laptop. Perhaps to be safe only up the voltage to 1.45v(which is what your old mobile should have been) and don't OC past what it will do on that, of course checking temps as you do this.