Check to see what you have running in the background. There may be some updates taking place, like a Windows update, or a virus scan. I know this happens to me when gaming. I go into task manager and disable the apps I know I wont need running. I also know some firewall and AV apps have a game mode which temporarily disable them so the game lag drops and the frame rates go up a bit. You video card specs seems fine. Better than mine and I get a consistent 60 FPS playing games like Skiyrim, L4D, Farcry 3 and Fallout New Vegas.