well i can tell you this much i just recently upgraded from a geforce fx 5200 and when i was using that i played doom 3 just fine no screen lag or anything, what alot of people dont realize its not just the video card its a combo of ram video and cpu speed with 1 gig of ram and a 5200 u can play doom 3 ut2004 etc no problem i wouldnt recommend maxing out your details and resolutions but imho only idiots do that anyway.. why strain yur system for a few pixels i always max my system toward better performance, being an online competitor lagging out in a firefight can be a real bummer..even with lowest settings you wont notice any difference unless you got a microscope and youre counting pixels one by one