The Ultra-D (and the CF-DR) most certainly supports the X2. Head over to dfi-street.com if you would like to talk to people with an Ultra-D and an X2.
a biased statement indeed. having 512mb will not improve preformance in the slightest, now if you would have said "I persoanly believe (not from being a fanboy) that the GTX512 w/ 24 pipes and 550/1800 clockspeeds will cream the XT.", then it would not have been so biased. IMHO