I'm generally an idiot when it comes to this stuff...especially considering other's plethora of knowledge, but that thing will have to be DAMN powerful to beat an nvidia card to that extent in crysis.
Crysis is optimized for nvidia, and compared to other games, ATI cards perform poorly in it. I doubt those are legit.
But then again...http://www.electronista.com/articles...870.test.leak/
So I just don't know. Also, Nivida is bumping up it's 9900 to July I think, so lets see how the 9900 performs against the 4870...