Product description and Specifications : Firewire 1394a Ports: External x 3 and Internal x 1 PCI 32-Bit 33MHz Interface Compliant with PCI Specification Revision 2.2 Support PCI Bus-Master Access Fully Plug & Play compatible No Driver needed for supported MS Windows 98SE/Me/2000/XP 32-bit/XP 64-bit/Server 2003/Vista/Win 7/Win 8/Win 10, Linux or Mac OS 1394 OpenHCI Specification v1.0 and v1.1 compliant Support IEEE 1394-1995 Standard for High Performance Serial Bus 1.0 with 1394a-2000 Data transfer rate: 100/200/400Mbps supported External port: 1394a 6-Pin x 3 ( 2 X 6 Pin + 1 x 4 pin ) Internal port: 1394a 9-Pin x 1 (Shared) ( 1 x 6 Pin internal ) System Requirement: PC computer with one 32-Bit PCI slot Supported OS Package contents: 1 x PCI 1394 Adapter 1 x Low profile bracket