EuroGamer: How Powerful is the WiiU Really?

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zarx said:

And the Wii U likely doesn't have a GPU as powerful as a HD 4850 that is over 4 times as powerful as the X360's Xenos which would certainly be dramatically outperforming IMO. 

Partially correct.   Many people early on suggested the Wii U's GPU would be based on the HD 4770 which is only slightly less powerful than the HD 4850 (960 Gflops vs 1000 Gflops).

I myself still believe the HD 4770 is likely given the power consumption benefits and currently active die process (40 nm).