|Question||What is the difference between AC97 and HD audio device?|
HD Audio (Intel High Definition Audio) has better sound quality and it supports more feature below.
HD Audio has presence pin, when your plug audio device, it can detect the connection of audio jack.
Supports redefine audio jack connection
Supports front audio & rear audio to play different sound media simultaneously.
4. HD Audio supports up to 7.1 channel, and AC’97 supports up to 5.1 channel.