Asus Maximus III Extreme - Manual (Page 70)

5. OC station connector (8-pin OC_Station)
This connector is for ASUS OC Station connection only. Connect one end Connect one end
of the supplied data cable to the GP connector on the OC Station and the
other end to this connector and USB13 on the motherboard to enjoy easier
overclocking.
6. IEEE 1394a port connector (10-1 pin IE1394_2)
This connector is for an 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.
Never connect a USB cable to the IEEE 1394a connector. Doing so will damage
the motherboard!
The IEEE 1394a module is purchased separately.
2-40 Chapter 2: Hardware information