This is just a speculation sheet, with actual specs from currently released cards to make it look more legitimate.

28nm? No way that this is even possible. And even if ATI wanted to do a pilot chip on 28nm as they did with the 4770 on 40nm, it would not be with a chip that is over 2billion tranies. That is stupid.
384bit bus width? This would be a dramatic change in thinking for ATI.

Again, this is just a speculation.


In the likely event that we will see a 5890, it will still be on the 40nm process. But, I would expect it to come out once TSMC gets their acts together.