On my about Mac it says that my Processor is 1.33GHz PowerPC G4. Which is right...but when I go to system profileer is says: " CPU Type: PowerPC G4 (1.2)" WTF!!?!?!?!?
It's a countdown to the Intel machines, your 1.6GHz is 3, the new 2.0GHz are 2, that means there will be one more rev to the iMac before the Intel chips go in.