Anyone with more expertise, please correct me if I'm wrong and add your thoughts to this thread. The way I understood computer chips was that chips from the same architecture of different speed ratings (2 ghz, 3ghz etc) were in fact identical chips. From what I understood from overclocking many PCs was that during the manufacturing process there was a variation in the quality of the chip. Thus a chip of architecture X, that came out "flawless" would be rated at 3ghz, while one that maybe didn't do so well in quality control would get rated at 2ghz. Sometimes though, the chip is locked at a lower speed when it is perfectly capable of reaching much higher speeds. So in essence, aren't the 2.0ghz UMB and the 2.4 UMB the same chip wise? I know the FSB is the same so there must just be a difference in the multiplier (chip speed is FSB*Multiplier so 1066*2.3=2.4) Do we have access to changing the multiplier on macbooks to see if they will run stable at the higher speed? I imagine with an aluminum unibody, the slight increase in heat shouldn't make much of a difference. I haven't done any overclocking in many years so please correct me but it seems like with a little tinkering you could run 2.0 ghz macbooks at 2.4 levels. Not that it makes that much of a diff.