That 7870 would probably have a 15%-20% performance advantage over that 7850 with both at stock, but it would also probably run much hotter.
yeah and plus its probably noisier as well so I dunno should i go with better performance or better cooling and less noise. I couldnt find much review on the powercolor. If it were u would u go with the 7870? giving that it's only a $10 difference.