Full Duplex Channel: The PCI Ex1 transmission rate of PCI Ex1 to IEEE 1394A riser card adapter is 2.5Gb/s, and it is a full duplex channel. Compatible Devices: PCI Ex1 to IEEE riser card for DV camcorders, hard drives, removable drives, scanners, digital cameras and other FireWire devices 3 Ports: The IEEE 1394 riser card has 3 external FireWire(1394a) ports, allowing more 1394a devices to be easily connected to your computer. Transmission Rate: PCI Ex1 to IEEE 1394A riser card adapter supports 400/200/100Mbps data transmission rate. Wide Compatibility: Firewire riser card is compatible with PCI Express version 1.0a, compatible with IEEE 1394 to 1995, 1394a 2000 standards, and compatible with IEEE 1394 OpenHCI specification V1.0 and V1.1.