Well, the time for an video card upgrade has come. Trouble is, I do not know how much of an increase in performance I should expect. I am currently running on a Athlon 1900+ (1.6Ghz) CPU with 512MB RAM and a GeForce ti500. I am interested in either the x800 Pro or the nvidia 6800gt. My mobo does not support 8x agp, but I have heard that it does not make much of a difference for now. What sort of increase should I "expect"?