You must be using the bios 502 that shipped with the board, can you confirm this please.

Bios 703 and beta 805 WON'T give 1.77vcore using the overvolt cpu option. Max with these two bioses is 1.58vcore.

You can flash to these newer bioses and confirm that for all of us if you like. If correct it looks like only bios 502 gives 1.77vcore.

I'm running 805, 703 was ify for me. I don't want to flash back to 502 atm.