The AirPort Extreme Card allows your AirPort Extreme-enabled Mac to communicate with local AirPort Extreme networks or other Wi-Fi certified 802.11b or 802.11g networks, including earlier versions of Apple’s AirPort Base Station. AirPort Extreme-enabled computers that join an AirPort or other 802.11b wireless network can achieve data rates up to 11 Mbps—the maximum allowed by 802.11b. For higher data rates, you need both the AirPort Extreme Card installed in an AirPort Extreme-ready computer and an AirPort Extreme Base Station. AirPort Extreme provides a range up to 50 feet at 54 Mbps and up to 150 feet at 11 Mbps for AirPort Extreme-enabled computers.
This AirPort Extreme Card is not compatible with the Mac Pro or the Power Mac G5 Dual and Power Mac G5 Quad computers.