Asus Crosshair IV Extreme Manual page 76

10. Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF)
port(s). Connect the S/PDIF Out module cable to this connector, then install
the module to a slot opening at the back of the system chassis.
The S/PDIF module is purchased separately.
11. 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 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 Audio�;
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 Audio�.
Chapter 2: Hardware information