The Dell cards are voltage locked as far as I am aware. Only thing you can change on them is the frequency, either a an offset or using a boost curve for more granular control. Neither voltage nor power limit can be set above the default on my RTX 3080.
Hiya Y'all, I use a R13 with  a NVIDIA RTX 3080, standard it says its overclock here, but i turned that off because the card is standard 1,1V...you can swipe that to 1,2 but im pretty sure you will have problems because a 3080 dont need overclock about that because its high architecture,1,1 to 1,2 is dangerous. Better leave that overclock RTX 3080 Dell 
Aurora R13, RTX 3080 overclock