The firm needed to come up with a new south bridge sharpish. It had been using one supplied by ULI, but that firm has now been bought up by ATI arch-rival Nvidia.
We hear that there should be working retail motherboard samples based on RD580 north bridge and RS600 south bridge around May, and you should see a bunch of these boards at Computex.
There is a bit of a shortage in the chipset business so you can pretty much sell any south bridge you have, but ATI needed to improve its south bridge to match the competition, as we are talking about the super high-end chipsets here. µ
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