It's just given what I know about Apple's firmware. Yeah, on the PC side it usually just needs you to change some clock multipliers and bus ratios. You do need an update to go from single core AMD Socket 939 to dual core though.AidenShaw said:In general, PC BIOS firmware doesn't need to be updated for different speed chips in the same family - and usually f/w supports Celerons from the same family.
Different families may require f/w upgrades (I upgraded a Compaq 2.0 GHz dual Xeon to a 2.8 GHz Xeon with HT - that needed a f/w upgrade to enable the HT).
Merom will likely need new f/w.
Of course, Apple could block upgrades via firmware or TPM....