The G4 iBooks support AirPort Extreme, which has 5x the bandwidth of the original AirPort. Although the G4 iBooks use a G4 CPU, it’s not the same version used in the PowerBook G4 – this edition has only a 256 KB level 2 cache, which means it won’t provide the same performance as a PowerBook at the same clock speed. With the introduction of the G4 iBooks in October 2003, Apple phased out the last Macs with G3 processors, which had been in use since November 1997.
