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With my PC I just plug in a new processor or swap out the motherboard & processor, which happens to be a very cheap solution.

This is also possible on most Apple desktop machines, and has been for ages. My G4 Cube for example came with a 450mhz processor, and can be upgraded to a 1.4ghz G4 by replacing the processor card (CPU and L3 cache). Several companies release PowerPC upgrade kits, and some even go between generations. G3 Powerbooks can be upgraded to G4 processors.