All of the next generation Intel CPUs will be based on the mobile chip design. Favoring throughput instead of clock speed -- following AMD by some years.
Well, yeah. Though that mobile chip design heralds back to the P3, P2, and ultimately P pro chip which was the original P6 core.
But I was merely responding to your heat issue/comment. While yes, P4s get extremely hot, you can cook an egg on them, the mobile chips don't so much.
And AFAIK, the centrino mobile chips are cooler than your equivalent powermac.
(You didn't specify, so I mentioned the IBM-PPC970/G5. The motorola 7450's/G4 might be cooler. I don't know)