hi im wondering if i should pair my a6-6400k with a 6570 to essentially "crossfire" with the two. or should i buy a 7790 even though it will be bottlenecked some. also if i should go with the 6570 which one will be best for price to performance ratio
7790:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121727R
7790:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121727R