We found out one key thing about the new R580+ chip. We gave you most of the details already, but we can now confirm that ATI's new chip can and will support GDDR4.
All cards after the R520 could support GDDR 4, but obviously the next generation GDDR 4 memory will simply work better with the new chips. The new Radeon X1000 generation memory controller has the support but obviously R580+ will have even better and more polished support.
Companies such as Samsung and Hynix have been sampling GDDR 4 from late 2005, so I guess by the time the 580+ is ready in late summer, there are unlikely to be many problems with memory shortage. GDDR 4 is a progression from GDDR 3 memory with some tweaks, squeaks and extra whistles.
Chiefly, it can work at very high frequencies. GDDR 4 should be in mass production this year. We don’t know when Nvidia plans to embrace this marchitecture but it could be with its G80 technology.