ps3 phat is still a bit superior
i tried playing tekken then go to xmb to read msg .
tekken 6 on background immediate lag lol . but on ps3 phat it is fine
and i dont think heat is really a prob whether got air con or not unless u put into closed cabinet with no breathing space.

of course the mobo also makes a diff . it is hard to explain why 1st batch ps3 is really faster in loading certain games and xmb .