Like title says, will be building a system with a 7750BE CPU, going to try for 3+Ghz. When will this become a limiting factor in games as i dont want to get to high end of a GPU and have it CPU limited, will upgrade to Phenom II or new .45nm Athlons in 12-18months and will upgrade video then as well so something to get me by till then , will be playing at low res on a 720P 32" LCD HDTV. Was thinking a 4850 or should i just buck up the cash and get a 4870?