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Nvidia did have the full fat core ready and shipping around the same time (dates maybe of a little but not much), a fair time before they released it in gaming/consumer form, for use in the titan supercomputer. Guaranteed high margins from professional/scientific markets seems to be the consensus as to why nvidia can go so early for their big core.
290X is not full fat!!!
The Contingency is ready
As usual NDA stops me from saying very much. Yes I do have more info but I cant share it.