Strange... My P4 631 can work with P5E3 Prem X48, Asus Commando P965, Asus P5K P35 and Formula X48. Try other bios/clean pin side of processor using alcohol/if you have done any vid mods, remove it. I can't say anything more

I tried many times, with no mod, but still failed to boot this P4 641 on ASUS X48/X38... but my any other P4 641 worked fine. I really have no idea what the hell with this Malay P4 641...