I don't see why Apple wouldn't have made a mockup or a G5 laptop. IBM made a Thinkpad with a full blown desktop P4 and managed to cool it (G40/G41 series).
I've come to the conclusion apple intentionally crippled the PowerPC mobile options there at the end. You have to figure the Intel/Apple negotiations had to have been at least a year or two. That would have given plenty of time for Apple to come up with a road map to incorporate x86 into their lineup. By late 2005 there was no competitive reason not to have either a Dual G4, or some kind of "G5" solution. *Puts Tinfoil hat on* What I'm trying to say, is that I PERSONALLY believe that Apple had intentionally handicapped the mobile options so that the performance comparisons between the last G4 PowerBook, and the first MacBook with x86 looked much larger than they had actually been. I mean, from a marketing standpoint that is probably the best thing you could have ever done. That would boost sales as everyone wants "40% FASTER!" performance from the year before.
I might be completely wrong here, but I don't understand how you can have a nearly 3Ghz Quadcore PowerPC chip in your desktops that was performance competitive with any of the Intel Offerings. Then your highest performance Notebook is still running with a Single core chip at half the clock speed. That's just too big of a spread to make me believe they had been trying their hardest to compete.
On the Overclocking side of things, I don't think I'm going to be getting much higher. I increased the MaxBus to the next step which is only a 5Mhz bump (12x) so 60Mhz Clock Speed. That was NOT stable. I started getting Geekbench scores in the range of about ~600. Clearly something was not working right. Changed out all of the RAM, though it might be something there. Same problem persisted. So I bumped up the voltage to 1.60v and gave it a swiz. I couldn't even get it to boot up fully. No crash, no nothing, just would shut off. I noticed there was literally no heat, not even the fans came on before the shutdown. So I'd come to the conclusion the VRM's couldn't put out that much power when the Overshoot happened on the CPU. Went back, changed it down to 1.5v, and got it to boot to desktop, but it still was not stable from the power delivery point of view. I could go about 30-45 seconds and the machine would reproduce what had happened at 1.60v. Sometimes It would crash at the Apple logo during boot up, so same problem as before.
Looks like I've hit the limit on this board, nowhere near what was doable on the old one though. Seems to be very much luck of the draw in terms of the untapped potential on these chips.
