The Cell contains ONE ~3GHz PPC core, Wii has ONE ~700MHz PPC core, XB360 has THREE ~3GHz PPC cores, so, as far as CPU matters, Wii emulation should not be impossible, while emulating the two other PPC cores using SPEs AND obtaining the power of two 3GHz ones wouldn't be easy at all. In the glorious DEC Alpha times, DEC was able to emulate a 200MHz 486 with a 500MHz Alpha (that had several times the computing power of an hypothetic 486 equally clocked), but Alpha was a general purpose CPU, while SPE is a special purpose one, so it would struggle a lot more to emulate a GP one, despite being Turing complete. It's quite unlikely that six of them could deliver the emulation of two PPC cores at roughly their same clock. So XB360 emulation, if possible, wouldn't deliver enough performance to run games smoothly, although it could be used for study and reasearch, development and mere curiosity purposes.
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