Firewire 800 is another name for cards that conform to the IEEE1394b spec. 1394b is capable of up to 800Mbps, depending on devices. 1394b uses a 9-pin connector and is capable of much longer lengths than 1394a. 1394b is backwards compatible with firewire 400 (1394a) using 9-pin to 6-pin or 4-pin adapter cables.