Dont use the current set of drivers, they are completely broken. They improved a whole bunch of stuff for SLI but single gpu performance took a hit. I was getting 35 fps on low on bf4 at 1080 with my OC 780 on the current drivers. Changed back to R331 and it was back to normal, pretty much 65+ on ultra all the time. Do a driver a rollback and if that doesnt work i cant really help you to much, but imo R331 drivers are your best bet.