We all know it doesn't come anywhere near the next gen machines. It may have a gpu that is similar in that its much more modern but it's held back in every other regard.
In the Trine 2 thread, a developer of the game basically confirms the Wii U is more powerful than the hd twins but it doesn't have the power to run the game at 60fps at 720P. A mid range PC could easily do that, probably even at 1080P.
The GPU specs are pretty well laid out. It's GPU is based off of an AMD card from 2010. It's CPU is heavily based off of the old IBM Power PC chips.