Posting again because I guess no one else tried or reported back...
Has anyone tried this it is suppose to reduce power consumption. Didnt know if any of you would have luck with it. I tired the first suggestion without luck and was going to see if the second suggestion maybe worked by the doctor aka tekcomm.
https://github.com/RadeonOpenCompute/ROCm/issues/463 The Doctor is working on that. We're all waiting for the true under voltage on all Vega rigs.