You've said this before and we've answered before...You would have to love trees to be concerned about 40 watt difference, and I mean properly go out on long walks at night alone and love trees.
No one really cares about power use. I'll take 500 watt graphics card.
More power = harder working cooling system = more noise.
I guess as well as "loving trees" you frown on being able to hear yourself think as well