Belkin F5U220 USB 5 Port 2.0 PCI Card Adds 5 USB 2.0 hi-speed ports to your computer (4 external and 1 internal) Backwards compatible with USB 1.1 devices Supports up to 127 Hi-Speed devices and 254 Full-Speed/Low-Speed devices from 5 ports 480Mbps data speed Windows 98 SE, Me, 2000, OS, or XP with USB 2.0 support/Power Mac computer running Mac OS X v10.2.7 or above