I have a 350Mhz CPU from a Rev 2 B&W running at 433Mhz @66Mhz bus in my Beige.

The only thing I can think of what you mean would be some of the third party upgrades but IIRC the faster ones automatically detect the bus speed and run at the right speed like many of the later AGP containing G4 ones do.

For example, the sonnet encore(ZIF)

The Encore hardware automatically configures the correct bus ratio without the need for switches.

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