What about the power consumption when mining ethereum? Any info?
Not sure what you mean by this , the power consumption depends on the card not on the Algo you are mining. X11 gives you a higer Hash rate than scrypt on the ALgo basis but youre
still pushing the card to its limits so power consumption does not change.
a 280x pulls around 240 at the wall
this is incorrect, the power consumption depends on the Algo, the same card can pull for example 270w on scrypt or less than 200w with other algos. you can find a lot of tests on bitcointalk, like this one: