RX480-31.8HighPower.rom 125w 31.5mh
RX480-30MhOTBLowEnergy.rom 100w 30.5mh
480LowEnergyOK.rom 85w 29mh
RX480Mod.rom 105w 28mh
the 480LowEnergyOK.rom is the most efficient
That is what GPU-z says, but not real power...
of course real power is more. just something to compare. i saw my plug on the wall and could also see the raises in watt. from 320 it even reached 400. its better than nothing. dont like it? dont see it

my power meter on the wall confirmed that the lowest power usage come from 480LowEnergyOK.rom while maintaining 29mhash