The USB2-PCICOMBO has a USB 2.0 and IEEE 1394a (Firewire 400) slot this allows the user to have both USB 2.0 and IEEE 1394a connection types on one PCI Card. Running at 480 Mbps the USB 2.0 connection is slightly faster than the Firewire connection but both have different uses. The USB2-PCICOMBO houses 2x external and 2x internal USB 2.0 ports and 1x 4 pin and 1x 6pin external firewire (IEEE-1394) ports. Specification:Compliant with Universal Serial Bus Revision 2.0.Supports Data Transfer Rates of 1.5/12/480 Mbps.Compliant with Open Host Controller Interface Specification for USB Revision 1.1.Compliant with Enhanced Host Controller Interface Specification USB 2.0 Revision 0.95.Hot-Plug feature allows you to connect/disconnect devices without powering down the system.32-Bit 33 Mhz host interface compliant to PCI Specification release 2.2.Supports PCI-Bus Power Management interface Specification release 1.1.Max. 5v/500 mA Power Supply.Supports Windows 98/SE/2000/ME/XP (Needs Service Pack 1)IEEE 1394a (Firewire 400) with data transfer rates of up to 400Mb/s.Complies with Standard for IEEE 1394 High Performance Serial Bus.Works with many DV Camcorders for digital video creating/editing.Hot-Plug feature allows you to connect/disconnect devices without powering down the system.Supports Plug and Play specification.Connect up to 63 devices. 2x External & 2x Internal USB 2.0 Ports 1x 4 Pin and 1x 6 Pin External Firewire (IEEE-1394) VIA Chipset for PC use only Compliant with Universal Serial Bus Revision 2.0 Supports Data Transfer Rates of 1.5/12/480 Mbps Compliant with Open Host Controller Interface Specification for USB Revision 1.1 Compliant with Enhanced Host Controller Interface Specification USB 2.0 Revision 0.95 Hot-Plug feature allows you to connect/disconnect devices without powering down the system. 32-Bit 33 Mhz host interface compliant to PCI Specification release 2.2 Supports PCI-Bus Power Management interface Specification release 1.1 Max. 5v/500 mA Power Supply Supports Windows 98/SE/2000/ME/XP (Needs Service Pack 1) IEEE 1394a (Firewire 400) with data transfer rates of up to 400Mb/s. Complies with Standard for IEEE 1394 High Performance Serial Bus. Works with many DV Camcorders for digital video creating/editing. Hot-Plug feature allows you to connect/disconnect devices without powering down the system. Supports Plug and Play specification Connect up to 63 devices