Maybe I set the question in bad way but I meant not to undervolt Nvidia cards but to make lower power limit as much as possible.
I am waiting when there will be possible to install 396 Nvidia driver in SMOS to lower -pl to 65w on my 1063 cards rigs.
And as long as its still be 390 Nvidia driver in SMOS I will NOT register my rigs here and will continue to use Ubuntu.

Sorry, Tytanick