G4 Redux

I did not get a reply below, so I thought I would re-ask. I do not mean to be annoying just trying to get information. What are the advantages of the G4 over ther G3 and the P4?

The G3 and G4 are both highly optimized for efficiency, P4 is optimized to hold more Mhz. This translates into, P4 can load alot of Mhz onto 1 chip, and g3 & g4 loads a few mhz, and gets the same results.
(thats a basic difference, it gets much deeper.)