The Aria Extreme N Airport Extreme PCI Card from Sonnet is an expansion card for the Power Mac G4, Power Mac G5, and PC systems that feature PCI expansion slots. It adds 802.11b/g/n Wi-Fi capability to any of these computers.
802.11n for superlative data throughput speeds
Backwards compatibility with 802.11b and 802.11g devices
Compatible with standard Wi-Fi encryption protocols