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That's not to say that CPU upgrades don't exist at all, but they require significant modifications to the logic board and is basically permanent.

I am aware of a time where it was either Sonnet or some other company offered PBG4 CPU upgrades so it's definitely possible but not particularly practical, even then let alone now.
 
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That's not to say that CPU upgrades don't exist at all, but they require significant modifications to the logic board and is basically permanent.

I am aware of a time where it was either Sonnet or some other company offered PBG4 CPU upgrades so it's definitely possible but not particularly practical, even then let alone now.

Permanency isn′t a concern IMO, but those are still single core G4, so likely to be a marginal improvement over 1.67. (Gonna be cool to find such PB second hand though.)
 
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(Gonna be cool to find such PB second hand though.)
If one turns up it’s probably going to cost a pretty penny due to collectibility ‘n’ stuff.

Some reviews I managed to dig up…


It’s so ironic that the person who had the 1.92 GHz upgrade done says they can’t get an Intel Mac because… Virtual PC doesn’t run on them.
 
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On my Mac Mini G4 1.42GHz (single G4) compiling GCC 6/7 from scratch takes multiple days.

I did get a PowerBook eventually, but just compiled heavy stuff booting the Quad from a Tiger installation I use on PB. But basically most of software compiles bearably [un]fast. Only gcc is a pain.
 
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