The dev is working those feature into the program but for now, use overdriveNtool by the guy on guru3d
Works great for all overclocking, undervolting and fan control. I mod all my bios with Polaris 1.6 but if I need to tweak anything after I use overdriveNtool
Could you please share a simple guide on how to undervolt with this tool mate? I don't want to mess up my cards

I don't know if I should even do it, since for the first two weeks my rig is finally stable *fingers crossed* and I don't know if that would cause any instability, that's why I'm asking. It just much simple with those commands to do it and not go in-depth, that's why I asked, I don't mind waiting tho. Electricity is 0.06usd, so 100-150w won't cause me to lose much of the profit. It just bugs me, that the cards are getting hot and the fans, therefore, are working at 60%, producing a lot of noise.