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A little update--I am very happy with my new baby so far, and here's one reason why....a composite screenshot of a simple project, just 2 Altiverbs, 1 PSP 84 delay, 1 Sonic Modulator, and a couple of VI's....it should be pretty obvious which is the Mac Pro and which is the MDD G4.
You may want to try using Apple's Activity Monitor Utility instead of the DP CPU Meter... you get a meter for each core with Apple. Much more accurate, too.