Asus PRIME H310M-K R2.0 Manual page 12

Front panel audio connector (10-1 pin AAFP)
This connector is for a chassis-mounted front panel audio I/O module that supports
HD audio standards. Connect one end of the front panel audio I/O module cable to
this connector.
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PCI Express 2.0 x1 slots
This motherboard has two PCI Express 2.0 x1 slots that support PCI Express x1
network cards, SCSI cards, and other cards that comply with the PCI Express
specifications.
PCI Express 3.0/2.0 x16 slot
This motherboard supports a PCI Express 3.0/2.0 x16 graphic card that complies
with the PCI Express specifications.
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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 Audio].
Chapter 1: Product introduction