On page 1-36 of the downloadable motherboard manual it describes a Front panel audio connector (10-1 pin AAFP) with pin diagrams for both HD and AC'97.
Intel High Definition Audio (also called HD Audio or Azalia) refers to the specification released by Intel in 2004. The older AC'97 codec is found on pre-2004 motherboards and on old PC cases. You have both connectors but should just use the HD Audio one. If you use an old PC case with only a AC'97 wired front panel, there is an option to change to the older AC'97 from the default HD audio setting.