"Wii U GPU is several generations ahead of current gen" Shin'en

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ViktorBKK said:

The ports that are in the market now, wouldn't even exist, if the Wii U was a massively different platform. It is not identical to 360, but it's not something entirely different either. A truly different system would be for example: ARM CPU, GPU with separate vertex & pixel shaders, seperate pools of ram.

Again, the 360 and Wii U aren't all that similar. CPU designs are significantly different, GPUs are of different generations. The Wii U is much more memory-intensive, with large caches and eDRAM favoured over raw speed.