Always assuming nvidia actually learn the process and makes a design that helps alleviate issues. Plus rumour has it that AMD are building a chip with the same die size as fermi (although it's very unlikely to be anywhere near as hot) for the NI cards. So it could be that the h6 series is ridiculously powerful, probably 2-3x faster than a 5870 judging by how AMD manage to get 2x performance on slightly bigger dies. Of course that is all rumour, but it's food for thought. Nvidia have no development headroom in terms of size, heat and power. AMD have absolutely loads if they ever want a killer chip.