Hello, I also have MSI RTX3080 Gaming X and some problems with ETH hash rate (88 only).
My stock BIOS was: 94.02.42.00.FB, flashed new Supreme X from techpowerup: 94.02.42.00.F9 but still no results.
No matter what I do GPU core is about 930MHz. Can You share Supreme X bios version and Afterburner settings for that card to get higher mh/s.