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GPU and CPU are two entierly different things. The wii has an ATI radeon GPU with its dedicated memory, I think it also has like 512mb system memory and ARM processor that doesn't touch 3d rendering. Likewise, when you use the opera browser it does not touch the 3d chipset (unless for some reason it is using it for acceleration, like rendering a 2d page as a 3d texture for speed/smooth scrolling, but that is purely aesthetic)
Don't get software rendering confused with hardware rendering. The nintendo wii's 500 mhz processor or w/e doesn't do rendering. Go install Q2test (if you have homebrew), and you can play quake 2 using software rendering, much the same way we did back in the day before 3d accelerator cards were mainstream, that's executing raw code all on the main CPU I think. It's quite slow and looks rather bad, but is playable. Though that game ran on my 200mhz Pentium pro like a beast. ID games have always been rather beastly however.
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