Apple iBook Memory Upgrade Configurator - choose your Model:

300/366
366 (Firewire)
500
600
600/700/800
900
G4 1.0/1.2GHz (early 2004)
G4 1.2/1.33GHz (Late 2004)
G4 1.33/1.42GHz (2005)
G4 800/933/1GHz