You can't use the Airport Extreme card in your computer but yes you can use the original Airport card with the AE base station with no problem. There is however a overall slowdown to your wireless network when an 802.11B signal is being used on a "G" network. Another option that I have read about is the Linksys cards are plug and play and available at places like Amazon for like $60. Chris On 5/21/04 7:01 AM, "Milan Kalus" <milankalus at qwest.net> wrote: > Can you use AirPort extreme card in PowerPC G4 450? If I use regular > AirPort card will it accept signal from AirPort extreme card in G5? > > Milan > Sent using the Microsoft Entourage 2004 for Mac Test Drive.