just to back up what's been said, i still run a HD4850 and i've had a reaaaally good run, on Arma OA single player i usually get around 45fps with medium/high graphics, with view distance set to around 7000. on MP it usually goes down to around 25 with 5000 view distance. so it just goes to show pre-made PCs are shiiiiiit lol. but anyway, just get a new graphics card dude. if you got one that is a 25nm card, you could theoretically use less power from your PSU but get more gain, but i dont think i'd feel comfortable hooking a 68 or 77 series card up to a 500W power supply lol. you'd atleast want a 700 to take care of all the extra work, and would hopefully have decent protection against surging.