Yes, they are transferring frames via the pci-e bus, Perkam, but the main thing you missed in the interview with David was that this ONLY WORKS WHEN SHADER DATA EXCHANGED IS AT A MINUMUM. This means that superAA and such will not properly work, as the slave card cannot push enough data through the bus.
This however, is only for the 8xPCI-Ex2, as as far as i understand it, the x1300 only needs 4 lanes, and 4 are for cross-communication. Once 16xPCI-Ex2 chipsets come out, for example, the newer cards will not be as limited, as is the current situation. You fail to see that the move IS GOING TO 16x PCI-E, but it's not gonna happen mainstream just yet, so is not CURRENTLY viable. that can change by the end of the month tho.
Its(it=x1600,]got three times the shader processors of x1300. Assuming games are limited by shader processing, its gonna be a fair bit faster so its unlikely it would work well on the x1600 without the interlink.
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