If it perform's like xfire 6850's. I am pretty sure they would have released it already. Paper launch or not, it would have put a pretty strong damper on the gtx 580 launch in addition to raise the 6xxx namesake, to increase sales of the 68xx cards even further.
They are not going to double everything unless they want the card to consume 300 watts + be 500mm in size.
I think the 3-4 tesselation performance is bull. Synthetics show the greatest difference in tessellation performance. People rationalizing that Cayman could be 2-3 faster in synthetics and even faster in games by the vagueness in the rumors shows how misplaced their rationality is.
Synthetics are coded to specialize in showing maximum prowess of a certain aspects. Drivers are specifically coded for them to maximize performance, hence why Nvidia kept on bragging about unigine heaven.
We won't see faster tessellation in games compared to synthetics. Be rational people.
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