Asus CROSSHAIR IV EXTREME User Manual page 60

4. 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 1394 cable is purchased separately.
5. Front panel audio connector (10-1 pin AAFP)
This connector is for a chassis-mounted front panel audio I/O module that
supports either HD Audio or legacy AC`97 audio standard. Connect one end
of the front panel audio I/O module cable to this connector.
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We recommend that you connect a high-definition front panel audio
module to this connector to avail of the motherboard's high-definition audio
capability.
If you want to connect a high-definition front panel audio module to this
connector, set the Front Panel Type item in the BIOS setup to [HD]; if you
want to connect an AC'97 front panel audio module to this connector, set
the item to [AC97]. By default, this connector is set to [HD].
Chapter 2: Hardware information