2port USB 2.0 Pci Card for Bothmac & Pc Supports High Speed Data Transfer Rates of up to 480 Mbps Supports Mac OS 8.6 to 9.2 (USB 1.1 only), OS X.0.3 (USB 2.0); Windows 98SE, 2000, ME, XP 40 Times Faster Than The Original USB Fully Backwards Compatible With USB 1.1 2 External Type A USB Ports