Is the HD Audio connector necessary?
If you’re not using them, than you can leave it unplugged. No as it is generally worse than the included audio Jack in the motherboard and wont hurt it to stay unplugged just make sure the power switch and reset switch are in most importantly.
What is the best connector for audio?
The sound quality is better than other two cable types. These cables transmit multi-channel audio formats such as DTS:X and Dolby Atmos. The HDMI audio connection cables can also support current and new video formats such as Ultra HD 4K resolution, as well as HDR formats.
What is HD Audio A ac?
Intel High Definition Audio (IHDA) (also called HD Audio or development codename Azalia) is a specification for the audio sub-system of personal computers. It was released by Intel in 2004 as the successor to their AC’97 PC audio standard.