Product Detail Adds 4 external and 1 internal USB 2.0 port to 32-bit PCI interface with VIA Chip Set Supports USB 2.0 devices and fully backward compatilbe with USB 1.1 devices Supports data transfer rate at 1.5/12/480 Mbps Universal card fits 3.3V or 5V PCI slot . The "4+1 Port USB 2.0 PCI Desktop Card - VIA Chip Set" is best product for you. We recommended 4+1 Port USB 2.0 PCI Desktop Card - VIA Chip Set