New G4's: Other Improvements

This eWeek article provides some interesting details that weren't mentioned at MacWorld regarding the new G4 Towers. Of note, it seems there have been slight changes to the motherboard:

the replacement of certain bridge chips should boost top throughput along the PCI bus to a maximum of 215M bps, almost twice the previous rate, representatives said.

As well, "the top-of-the-line model, which sports dual, 800MHz processors, will see a boost in actual throughput thanks to more efficient data flow between the twin chips' L3 caches (each of which are 2MB)"