http://www.engadget.com/2011/06/14/wii-u-has-last-gen-radeon-inside-still-more-powerful-than-ps3-a/
Certainly someone more learned in graphix technology could verify this, but what it means is anywhere between the 4670 at the low end and 4890 at the high end?
So Power 7 CPU and R770 Graphics card. I must warn everyone that the machine translation these sites seem to be using can't quite make out whether the original source is just speculating or not.
Monster Hunter: pissing me off since 2010.