AMD Radeon HD 6870 and HD 6850 confirmed to be launched on 22.10.2010

[tajoh111]

Its tough to expect much more out of the same process, but keep in mind that AMD used a 30% smaller core and got similar performance... and Cayman is larger than Cypress by a good amount, so I bet its performance is a lot higher than people think

But then again, bart xt is more or less 25% faster clocked than a 5850, which makes up for most of the difference. I doubt the 6970 will have significantly faster clocks because of its size(900mhz max) vs cypress(850). Basically everything has to come from core improvements and added components.

Clocks appear to match polygon counts on both cards(5850 and 6870).