I am running with 2 RX480 @55Mhash
with default bios. I just set the memory from 2000 to 2200 and that's it. My cards are Asus Rog and Xfx Black Edition with 8Gb both.
The power consumption is
130Watt for Asus and 115Watt for Xfx. Temperature is normal 70-75 Celsius and working smoothly so far.
I will try to reduce the consumption without loosing Hashrate at all. (When I find a little time