JEMC said:
If I'm not mistaken, AMD will unify its motherboards, with the upcoming AM4 platform, and the first chips that will use that new platform are the Bristol Ridge APUs that will launch soon. What I don't know is if AMD will still rely on a Northbridge to provide the PCIe lanes or if they'll go like Intel and put that into the CPU. There was a blurry (of course) pic of the AM4 motherboard AMD used to demonstrate the new chips at Computex, and it doesn't seem to have a Northbridge chip. http://wccftech.com/amd-am4-motherboard-bristol-ridge-apu-spotted/
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Having already the northbridge included in APUs it would perfectly make sense, with unified mobos, a northbridge on board would be redundant when using APUs, and it also offers the possibility to get an updated northbridge when upgrading the CPU, and for a modest increase in CPU cost it probably generates bigger savings on mobos.