http://gamasutra.com/view/news/35118/Wii_U_Will_Have_AMD_Radeon_HD_IBM_Power_Microprocessors_And_25_GB_Discs.php
"Nintendo also partnered with AMD to use the company's custom AMD Radeon HD GPU in Wii U, bringing high definition graphics to a Nintendo console for the first time -- something gamers have been clamoring for from the platform holder for some time.
AMD says the GPU reflects the best characteristics of its graphics technology solutions, offering "high-definition graphics support; rich multimedia acceleration and playback; and multiple display support".
"AMD shares Nintendo’s excitement for the new HD entertainment experience planned for the Wii U console,” says AMD's Silicon Enginerring corporate vice president David Wang.
"He adds, We’re proud to provide our leading-edge HD multimedia graphics engine to power the new entertainment features of the console. Nintendo is a highly-valued customer and we look forward to the launch in 2012."
Related news:"
What we know about the gpu:
- Has the HD label.
- Has multiple display technology(Eyefinity?)
- If it does have Eyefinity incorporated, then it is either based on the R8XX or Nintendo and AMD incorporated Eyefinity into a R7XX based GPU.
- Must pull of effects present in the Nature Tech Demo
- It musn't be so weak that it acts as a bottleneck in the system relative to the Power 7-based cpu.
So a custom GPU based on the R7XX or R8XX families makes the most sense.