Apple PowerMac G4 Memory Upgrade Configurator - choose your Model:

1GHz (FireWire 800)
350/400 (PCI Graphics)
400/450/500 (AGP Graphics)
400/450/500 (Gigabit)
466-733 (Digital Audio)
533-1Ghz (Dual CPU)
733/800/933 (QuickSilver)
Cube 450MHz
Dual 1.25GHz (FireWire 800)
Dual 1.42GHz (FireWire 800)
Dual Optical 1.25GHz (Mirrored Drive Doors)
Dual Optical 1GHz (Mirrored Drive Doors)
Dual Optical 867MHz (Mirrored Drive Doors)
Server 450/500