hi people,Thanks for taking the time to view this problem,my son has a old pentiumII 266,now there werea few games he couldn't play,so i got him a p400 cpu hoping it would just slot in and upgrade it's self!! but no it has not found it's self,infact it insists it is only a p240,and that is the maximum speed it will let it goto in the soft menu aswell, what am i doing wrong? do the bus settings need to be changed?do i need to cover a different jumper?how can i find out what speed the bus is running at? thanks for ur time cheers