help please

[Mason-]

Okay building my first PC and the am now plugging the front panel things into the motherboard (MIC + HEADPHONES + USB ports)

Okay now I have done pw switch reset switch all the LEDs
now all that is left is the USB ports which have there seperate slots on the mobo for I'm fine with that.

But there are 2 yellow headed things

one says

HD Audio other says
AC'97

Which one to plug into the mobo?

 

[SeraphX]

if you havent got the cables you dont need to, onboard audio only needs the front audio plugged in to work not sure why but it's the case lol