maybe with more gpus than one result is better. i only have one. so half of my total watt is wasted on the pc
It's not wasted , your memory and memory controller using it . Set the memory voltage to 950 , 925 , 900 , 880 with wattman. Find the stable settings where your not loosing from the hashing speed, and you can save a lot of extra watts .
In wattman I can't change voltage (inactive). I use Wattool 0.7. But after I close programm or reboot - I need to change voltage manualy again.