Asus M4A89TD PRO/USB3 User Manual page 50

7. Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port. 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.
8. 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 [AC 97]. By default, this
connector is set to [HD].
Chapter 2: Hardware information