I used to question that at first too, i went from some crappy video card (i dont even remember what it was) to a 7600gt. There was HUUUGGEE difference in my games. For example when i played oblivion BEFORE i got the upgrade, it seemed as if i was playing a game where every 3-4 seconds a new screenshot appeared (thats how laggy it was). AFTER the upgrade i was able to run the game smoothly on medium settings, which i was happy with.