I try to change voltage settings: 0725, 0720, 0730
But power consumption the same - 865-870 Watt

Also I try 100 Mhz/400GH with 0600 and 0725 volt - power consumption is the same: about 335 Watt or 0.84W/GH

But I think that undervolting to 0.6 volt should get me about 0.5-0.6 W/GH

Why volt changing is  not working?