Originally posted by Rhumgod
Nothing, however the G5 is much better. The G4 is deadlocked at 1.5, as quagmire stated above. Freescale is vaporware. Apple has released specs for the PowerBook G5 already in 10.3.5. The G5 is coming.
Freescale isn't vaporware per se, it's just a company that is developing a product that's not done yet. They have made no claims about anything, and we have no idea how far along the Freescale engineers are, but I'd put money on the fact that they have more than an idea.
Next, the G4 isn't deadlocked at 1.5Ghz. That's rarely the case with processors. Better fabs will make the frequency higher, and revised/added logic makes it faster without the clock speed increasing. With smaller feature sizes and dynamic power management, often it is better to add logic rather than ramp clock speed.
If the e600/700 are what they are planned to be, then it's a much better solution for a laptop than the G5. You heard me. . . faster, less power, and much cheaper for Apple to build a PCB around. The G5 is not all that cool of a microchip. Very conventional aside from Altivec, which IBM didn't even want to put in it. The e700 is a much more modern design.
I'd take an e700 book over a g5 book in a second, but whatever comes out first I'm buying in 17" form.