One thing I think we can put to rest is this. As far as the issue of the Wii U GPU being a AMD 4000 line or 5000 line. It would definitely be the 5000. I think if, based off anything it would have to be the 5550. The 4600 line has two 400Mhz RAMDACS. It's also fabbed at 55nm. The 4600 is probably closer to 70 watts under a full load. The 5550 is 550 Mhz has the 320 SPU 15 TU 8 ROP and fabbed at 40nm. It has a maximum board power 39 Watts. I think it used the 5550 as a base with some newer tech added features. Either that or built straight from the ground up which I think unlikely.
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-4000/hd-4600/Pages/ati-radeon-hd-4600-overview.aspx
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-4000/hd-4600/Pages/ati-radeon-hd-4600-specifications.aspx
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5550/Pages/hd-5550-overview.aspx#2 (under specs)
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