Tried almost everything, but max volume is much lower compared to my old Maximus VIII Ranger (which also had SupremeFX with ALC880 codec).

Things I've already tried:
* reinstalling MB and audio drivers (my current version is 6.0.9126.1)
* following these steps
* messing with various windows settings like speakers config, audio enhancemens, etc
* changing settings in Realtek Audio Console like sound levels, amplifying, etc

I'm starting to think it's a motherboard / Realtek chip design issue, because I cannot come up with anything else. It's not THAT silent, but nearly twice as silent compared to my previous MB.