I have to question Techreport and Xbitlabs articles also. 6800U is losing or only on par with the X800XT, which doesn't make sense at all.
Could it be AA/AF? AnandTech provided both results and the XT won in some of the non AA/AF tests and was also much closer overall when AA/AF wasn't used. Using AA/AF and SM 3.0 seemed to help the 6800U and Extreme pull away more. Xbit only tested without AA and AF.