"Wii U GPU is several generations ahead of current gen" Shin'en

[ViktorBKK]

"Support for a superset of DirectX 9.0c API DirectX Xbox 360, and Shader Model 3.0+"

http://en.wikipedia.org/wiki/Xenos_%28graphics_chip%29

Xenos was based on early prototypes of the Radeon X1000 series. Even its predecessor, the X800 series, supported DirectX 9.0b.