Asus P5GC-TVM/S Instruction Manual page 39

13. IEEE 1394a port connector (10-1 pin IE1394_2) optional
This connector is for additional IEEE 1394a port. Connect the IEEE
1394a module cable to this connector , then install the module to a
slot opening at the back of the system chassis.
P5GC-TVM/S IEEE 1394 connector
Never connect a USB cable to the IEEE 1394 connector. Doing so will
damage the motherboard !
ASUS P5GC-TVM/S
1
IE19_2
1-27