so basically i want to know if it would be worth going through the trouble of selling my r9 270x on ebay to buy a r9 290x and spending more money on top of what i get back from my old gpu or would it be easier to buy another r9 270x (only spending 110$) on a used one and cross-firing them. is there a difference in performance..... preferably i would rather cross fire them but i want more opinions