NNO-Stephen said:umm... there can't be a "G5" with a 744x part number.
For someone that waltzes into a thread and starts telling other people that they don't know what they're talking about, that's a rather ironic thing for you to say. The "G4" is a marketing term that has been used for the 74xx series of processors, and the "G5" is a marketing term for the 970 family of processors.
Nothing but marketing is involved, and there is no magical barrier keeping Apple from calling a 7448 1.8ghz part the G23 if they want to.