At the moment I have a Nvidia 7900GS in my computer.However curiosity got the better of me and I bought a X1900GT rev2 card off Ebay which I hope to get this week. However is the X1900GT any faster than a 7900GS or have I just wasted my money needlessly?? I have seen X1800XL cards going for a similiar price - are these faster than the X1900GT or 7900GS?