whoa, you should not have fps drop on lowest settings. there are a lot of possibilities. it could be some software you recently installed running in the background slowing you down, or settings you changed, or it could be a failing or overheating graphics card. check the temps when playing CoD:Ghosts or other games and make sure it isnt going above 80-85c. also, the 660 is becoming out-dated, so i would upgrade to, maybe the 760 when you get the money. or you could get another 660 and sli. hope this helps!