Add 2 firewire 800 and 1 firewire 400 to your desktop computer through a pci slot the pci1394b 3 3 port pci firewire adapter card turns a pci slot into 2 firewire 800 ieee 1394b ports and 1 firewire 400 ieee 1394a port a cost effective solution that lets you connect firewire 800 devices as well as older firewire 400 devices to your desktop computer a versatile firewire solution the adapter card works in both 5v and 33v pci slots and in 64 bit and 32 bit operating environments maki