Overview

When sold separately, the AirPort Extreme Card requires one of these computers:

Power Mac G5
Power Mac G4 (FW 800)
PowerBook G4 (12-inch)
PowerBook G4 (12-inch DVI)
PowerBook G4 (15-inch FW800)
iMac – see this article instead.
iBook G4
eMac (ATI Graphics) (See Note)
eMac (USB 2.0)

These computers always come with the AirPort Extreme card built in:

PowerBook G4 (17-inch)
PowerBook G4 (17-inch 1.33GHz)