I'm from polish forum PCLab and i made account here only to inform you, that i have found solution for mine Gigabyte RTX 3080 4-5 beeps. One user said something about CMS, Legacy boot and GOP so i were looking for it and finally when i disabled CMS - beeps dissapeared. Same thing when you turn on ultra fast boot, then CMS is auto off.
I turned off CSM and there is no more beeping. Thank you for the idea!!!
Fast boot on or off does not change the beeping for me so I am leaving fast boot on.