I would like to know how I can fix the lag in my games, mostly fps. Fallout New Vegas on ultra settings with mods works fine and no lag. Payday 2 and Just Cause 2 seem to lag which makes it unplayable. I have an alienware x51 r2 with 1.5GB GTX 660 intel i7-4770 CPU 3.40 GHz, an ASUS VX228 Monitor.