paying attention to the OPs needs in bf3, he will get more out of the X6, especially overclocked to the same speed as a 980 and higher.
He might get a few FPS higher, but I still say go for something like the 965, which is on sale for like 114. Or even the 960t which is 125 and has a chance of being unlocked to a 6 core. At this point, go the cheaper route, even if you have to sacrifice like 5 fps that you wont even notice. There is a whole new generation of CPUs up and coming, and Thuban is, in an electronic sense, old. Just my opinion