The RD790 has been under development by ATI since before the company got acquired by AMD and should be a bit better than the RD600 chipset. The new RD790 is rumoured to be made on a 65nm process with support for HyperTransport 3.0:
The HT clock will scale up to 2.6GHz, as well as providing enough bandwidth for a stonking 42 lanes of PCI-Express 2.0 - that's enough for a couple of ATI cards in CrossFire (supporting physics, obviously), a couple of x4 lanes and a stinky x1 lane that will never get used because no one makes any boards in that form factor. No?Thanks to The Inq for this news.