Yea, I was wondering what is best. I read the article here on toms, but I'm still not sure, because even though Asus performs really good and silent, toms suggest buying Windforce.
I tend to say on the higher end cards, asus carries better silence and gigabyte usualkly holds overall effective temperatures. so really it depends on how silent do you want that card to be.
I agrees dudewitbow. their performance is similar from th reviews by tom's hardware.
Gigabyte 670 can have better cooling performance without using cooling config.