Well they did talk about overclocking a 6800GT to "be" a Ultra. They said that the GT OC'ed would be better than the Ultra, because of faster RAM timings. But I don't know about how reliable the stock cooler would be when OC'ing. Somebody wrote this on AnandTech forums: "I would ignore both and get the 6800GT for AGP. I can oc mine to 430/1114." Maybe you should check this out
http://www.nvnews.net/reviews/bfg_ge...oc/index.shtml