Well people think it's mixed in cause of this:That's what's being discussed, some think it's in there as a 1:1 copy, some think its functions are just mixed into the rest of the Wii U GPU. I would think a 1:1 copy would be small enough now to put in there to ensure perfect compatibility.
http://iwataasks.nintendo.com/interviews/#/wiiu/console/0/2
There's probably Wii only guts in there sure, but it sounds like they replicated functionality through the newer circuits as well so it's not just a known 1:1 thing anymore. Could be a little of it is gone, could be a lot, and the new equivalent/replacement stuff could be bigger or smaller than what was there on the Wii.Shiota Yes. The designers were already incredibly familiar with the Wii, so without getting hung up on the two machines' completely different structures, they came up with ideas we would never have thought of. There were times when you would usually just incorporate both the Wii U and Wii circuits, like 1+1. But instead of just adding like that, they adjusted the new parts added to Wii U so they could be used for Wii as well.
Iwata And that made the semiconductor smaller.