You might also get lucky and have the newer VRM module that allows for G4 ZIF CPU's to be installed. I can only imagine how much more of a speed increase I would get if I stuck a 600MHz G4 in my machine.

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Could you please expand on that? This was mentioned here once before but never explained properly and there's been a lot of conflicting info here about whether the Yikes! CPU can be dropped into any Beigey or if only the OWC/Sonnet G4s made specifically for the Beige will work, and there doesn't seem to be a lot of clear info about it anywhere else. I know that if you have a "ROYAL" VRM then you can't use any G4 CPU, either the Yikes or the specific Beige upgrade ones, but is there any way of using a Yikes! CPU? I only ask because the Yikes! CPU seems to be obtainable for next to nothing, whereas the other ones that look the same but apparently aren't are extremely expensive (more than a complete graphite G4 machine in fact!).