Why are you comparing the 7800GTX 512 to the X1800XT? Of course the 7800GTX 512 would win. Why don't you compare apples to apples? 77800GTX 512MB VS X1900XTX?
G71 is a disappointment...really. I expected nVIDIA to come out with something that blows the X1900 XTX out of the water, and it doesn't. Congratulations to ATI. I'll be your newest customer.