I don't the 4870 results are legit (though gt200 ones probably are) because we're talking about 50% more shaders and double the texture power, the increase should be far more than 25% (over the 3870) for such a high level of detail.
Also 3dmark vantage definitely seems to suit nvidia cards far better than ati cards, and its not a game so I don't really think 3dmark vantage is a good representative of what games will show. However, if the gtx 280 spanks the 4870x2 results by a large margin in 3dmark 06 which is favors the r600 cards, then its safe to say the gtx 280 will be the undisputed king for benching and probably games too.
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