which 7800gtx? 512 or 256?
the 512 7800 is way better but the 256 is just as good as the x1800xt but then the 7800gtx 256 is better than the x1800xl
look here http://www.bit-tech.net/hardware/2005/11/14/geforce_7800_gtx_512/1.html
they dont have fps comparison but it shows that you can play at higher settings with the new 512mb 7800gtx than the x1800xt making it better