Hi, I am gaming on a 1280x1024 resolution monitor and I am wondering if getting a 512MB HD 5770 card will give me a big performance decrease? I currently am gaming on a HD 5750 1GB GDDR5 card and when playing the game S.T.A.L.K.E.R. Call of Pripyat my fps stays really low when having the settings maxed. I am wanting to sell my 5750 card and get a 5770 but I see that the 512MB is cheaper. Should I grab the 512MB and would it make a difference in performance as I game on the 1280x1024 resolution?