I'm still deciding which parts i am going to buy for my next computer, and now im trying to decide between the 7900 gt or the 7900 gtx. My question has to do with the memory. my last card was a radeon x800 pro 256mb. In doom3 when i set the settings to ultra high, it reccomends 512mb video card though my computer with 256mb could still play it at ultra just fine. quake 4 on the other hand, with the same message, would not run on my x800 pro 256mb at ultra settings. does anybody know if a 7900 gt, with its 256 mb, could handle quak4 at ultra like my x800 handled doom3? or does quake at ultra high truely need a 512mb card?