Cryptonote powers usage is not accurate. It should draw power less against ethash. It's use the lowest power for those three of that algo.
My rig (Voltage offset @ -15)
ETH (27*5) Power usage 660W-670W
XMR (700*5) Power usage 460-470W
Everyone has got way better numbers than me, I need to spend more time flashing and undervolting my cards