I jumped onto the Freescale website because I was curious about what the differences were between the different versions of the G4 chip. Anyway, I got to looking and Freescale has its MPC7447A chip listed as its fastest in the line at a top speed of 1.42. A couple of questions then popped into my mind: 1. So everything Mac has that is over 1.42 and isn't a G5 is just an "overclock" or is Freescale's webpage woefully outdated? Some of the online stores have the 7447A listed as a 1.6 or 1.7 which is then overclocked. 2. I understand that the processors from the same die will act differently. Some can go faster, some are big ol' POS's. That makes sense. But due to my lack of knowledge on the subject, I'd like to know is this just some random thing that nobody can predict (ie. one batch will have a 12% rate of chips that can run stable at a higher than designed speed, another batch will have 73%) or are there tolerances that are added during the design phase that make this a much less random event? 3. Assuming that the top "natural" speed of the 7447A is indeed 1.42 as listed, how long could, for example, the PowerLogix 2.0Ghz G4 upgrade be expected to last before it gives up the ghost? You would think that a 33+% overclock would cause it to be highly unstable. OK, I await for your wisdom, oh mighty gurus on this site. Please educate me.