I could really use some help. Battlefield 4 just came out and I'm running it with an AMD FX 8350 4 GHZ, 8 GB RAM and an GTX 650 :<. It's very playable at the lowest settings and 1080p (70 fps+) but I think it's time for a new GPU upgrade since the next gen games are starting to come out in the near future. So i've been looking around for a new GPU lately and I wanted to get an GTX 760 4 GB but I decided to go with an AMD card swell since I will be playing BF4 and the Mantle update. And I'm not sure if I should go with the 280x or 7970. They are quite similar from what I've seen. Both cost around 350-400 dollars here in Sweden so I take the one I want but I could use some help from some experts around here 
Any answer will be very appreciated<!

Any answer will be very appreciated<!