RX 480 VDD not changing


I have a problem with my RX480. For example when I change VDD to 900mV nothing happens inside the miner. I check the miner using Shellinabox it says that VDD is 1000mV, on hive it says 900mV, I even lowered to 500mV :smiley: and nothing . Everything else works except VDD. I even moded a bios and added 900mV across all clocks and I still get 1000mV in team read miner. Is there anyone who can help :)?