Will all socket 478 processors work in 478 motherboards? I need to replace the board in my moms eMachine. It has a 2.6 Celeron on a 400mhz bus. The board I want to get is an Asrock P4i65G that says it supports Prescott, Northwood and Willamette but its bus speeds are 533/800mhz. Can I just underclock the board or change multipliers like on AMD boards? Thanks