StarTech PCI420USB 4 Port PCI High Speed USB 2.0 Adapter Card Type: PCI to USB Card External USB Ports: 4x USB Ports Internal USB Ports: 1x USB Port Standard: USB 2.0 Data Transfer Rate: 480/12/1.5 Mbps Operating Systems Supported: Windows 98SE/ME/2000/XP/Server 2003 and up Mac OS 10.2.6 or OS 10.2.8 Compatibility: Connect up to 127 devices by cascading multiple hubs Dimensions: 4.7 x 3.7
