The vlt function doesn't seem to work on RX580 cards. As the power draw from the wall did not change whether I tune 1100 to 900 and even 750. It just doesn't seem to applying my values.
Yes, I can confirm the same for my RX580. Even I change vlt to 850 or 900, power drawn from the wall is the same. What is also strange for me, globalpowertune parameter seems to not work too. Even I set 5/6/7, dashboard shows ptune 4, also ethos-overclock shows 4.