A question about PC audio outputs


Should I just use the front IO audio out (FractalDesign Meshify C) as I have been doing? I don't hear any interference or anything when listening to music or gaming through it. (Maybe FractalDesign shields their IO cables more?)

My motherboard is an Asus TUF B550 Plus. Is it worth it getting a headphone extension cable to use the motherboard audio output? Does the quality of the extension cable matter?

I also have an RTX 2080 in my system which I think supplies audio through my monitor via HDMI (Don't at me, I know I should use DP). Is that audio any good?

My earphones should be of a decent enough quality to pick up on a change in sound quality (KZ ZS10 pro)

Any help would be appreciated

siyonkart
I'm not familiar with your particular motherboard but it's been my experience that better sound can be obtained using an external DAC.  The little firefly USB dacs have good reviews and there are a lot of similar devices for even cheaper. 

A long headphone to RCA would work and sound OK but there are better optios.  
No unless you are resigned to it. My Asus soundcard is better but still sucks even through toslink compared to m2tech coax or USB purifier to whatever DAC does it for you. The cheapest one you can find is better than the built in audio.
There's no point in using the motherboard audio out if you're not hearing any interference using the case audio jack.