Gear Live has a Video Up with two Macs. One is a Mac desktop G5 PowerMac with two PowerPC CPUs running at 2Ghz each with 4.5GB of ram. And the other is a MacBook Pro with one Intel Dual Core CPU with 1GB of ram.
Now just a couple of years ago apple was singing how much faster the PowerPC was, but by this test where they compiled a load of Java files (a CPU and hard drive intensive task) the laptop was 36% quicker. Even though it had less ram, a slower hard drive, access time to the hard drive was limited because it is encrypted and laptop is just running one CPU. I think this calls into question what Apple has been preaching for the past few years.