The 1.6GHz G5 had 800MHz bus, the Dual 1.8 has a 900 MHz bus, the Dual 2.0 GHz has a 1GHz bus. The bus speed times two (1GHz x 2) = 2GHZ the speed of the machine. So if this stays the same, the Dual 3.0GHZ would have a 1.5GHz bus, wouldn't it? The 2.4GHz would have a 1.2GHz bus and so on... Does this make sense?