So I have been looking at updating my 7600GT to something a little faster as I think my 7600GT isn't as fast as I would like and I am partial to nVidia but the X1900 seems to be somewhat faster on some benchmarks and I am willing to give ati another try (in the past I have not been impressed) however I don't think I want a 512MB card as I don't think it's necesary. So my frist question is is the X1900 XT and the GT the same sans Memory? It seems as if the X1900XT comes in a 512MB only flavor and in order to get a 256MB card you need to get the GT version. Upon further investigation there appears to be some 256MB XT cards out there but they seeme somewhat rare as the majority seem to be 512mb'ers so I guess the question is the XT vs GT Big difference? I realize the clocks are a little higher on an XT (~50MHz) but I don't see that being a major difference I dunno what is the consensus about these three and bang for buck between the 7900GT X1900XT X1900GT all in the 256MB flavors...