Eurogamer explores the Wii U's AMD GPU in more depth.
It was ballpark speculation at the time based on what we had eyeballed at the event, but the final GPU is indeed a close match to the 4650/4670, albeit with a deficit in the number of texture-mapping units and a lower clock speed - 550MHz. AMD's RV770 hardware is well documented so with these numbers we can now, categorically, finally rule out any next-gen pretensions for the Wii U - the GCN hardware in Durango and Orbis is in a completely different league. However, the 16 TMUs at 550MHz and texture cache improvements found in RV770 do elevate the capabilities of this hardware beyond the Xenos GPU in the Xbox 360 - 1.5 times the raw shader power sounds about right. 1080p resolution is around 2.5x that of 720p, so bearing in mind the inclusion of just eight ROPs, it's highly unlikely that we'll be seeing any complex 3D titles running at 1080p.