I have an FX 8120, oc'd to 3.7. I am looking to get Batman Arkham Knight when it releases, and in case my current r9 270 x 2 GB card is not up to the task, I was wondering what a good upgrade would be, or if it would be worth it to run another one in crossfire (as this would be the cheapest upgrade option available to me). I was looking into a 4 GB GTX 960, but they are about roughly the same in performance, so I would hate to sidestep