We went along to see ECS yesterday, and we found one of ATI's RD600 reference motherboards on its stand.
RD600 is an interation of RD580, but with support for Intel's upcoming Core 2 Duo and Core 2 Extreme processors. It seems that it will carry many of the characteristics over from ATI's RD580 chipset, including great overclockability and ATI's XpressRoute technology.
Specific details of the north bridge are scarce at the moment, but it is likely to have the same number of PCI-Express lanes as there were in RD580, which had a total of 48 PCI-Express lanes.
This is part of ATI's XpressRoute technology, which means that the north bridge controls both video card slots. This is unlike NVIDIA's current solution, which has one PCI-Express x16 slot controlled by the north bridge, and the second controlled by the south bridge.
We'll leave you with a couple of pictures...
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