The performance differences between the 512MB card and 256MB card are very small and represent a terrific compromise of price over performance. The X1900 line packs a very potent punch that gamers can rely on to give them a great experience and the X1900XT 256MB doesn't change that one bit. In fact we saw more than a few times where the 256MB card still had enough punch to K.O. the 7900 GTX...