Hi, I just replaced my P4 2.4ghz 533mhz processor in my Asus P4T533 mobo with the P4 2.6c 800mhz Hyperthreaded. I am uncertain why but the speed is currently 1.8ghz. Multiplier is locked at 13 and no other option to bring the CPU to 2.6C seems to be available besides raising the fsb and voltage. Is this an incompatiblitity of the cpu fsb (800 vice 533) or is there something I can do to get this processor to function at its stated speed? Appreciate your help!