Hey guys need some input here, Currently i have an Asus R9 280x 3gb card and want to get some more FPS at 108p gaming. My main question is will it be worth it to purchase another R9 280x and crossfire them, my mobo supports it. Mainly do i have to get the exact same card or can the r9 280x be a different brand with possibly different speeds? Also is it worth it or should i just go buy a r9 390 and would that get me better performance. Its paired with a FX 8320.