Well, those Core 2 Duos/Quads run far cooler than those P4s.
As far as a power supply, I would definitely recommend that Corsair HX620W PSU, bar none the best to keep a CPU and PC altogether as cool as ice.
As far as a power supply, I would definitely recommend that Corsair HX620W PSU, bar none the best to keep a CPU and PC altogether as cool as ice.