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The follow up :

THERE IS A second chip on the upcoming G80 boards that does the I/O for the chip, something that has been integrated since time immemorial. Basically Nvidia took the entire display pipeline and put it on an external component.
The interesting bit is that the G80 is already huge, 480mm2 or so, a little bigger than the R600. Once you add in the necessary 50mm2 or so of the I/O chip, that brings the total to 530mm2, notably larger than the R600. For comparison the G71 is 197mm2 including I/O, so this one is almost triple the size.
Rest here :