Hi all I have bought a new P4 2.8Ghz CPU to upgrade my MX46-533V mobo. On the aopen homepage it is listet as has been passed on thios mobo but the cpu wont work on this mobo I have triede allmost everything - reset bios - unplugged everything to see if i had enough power but this CPU stays ice cold - and unoperational - the only thing I havn't tried is to get another memory module the one im using now is a 400MHZ FSB card - my question is does the P4 which has a 533FSB requires a 533MHZ FSB memory module to operate. All taken into consideration the CPU should work with the memory I have for the moment if it makes 7*400=2.8Ghz but I have not been able to find any information on whether the CPU FSB and the Memory FSB should correspond to each other. Any Ideas ? Regards Mark Larsen