Overclocking an iMac G4 with 133MHz Bus
Over at ethernetworks.de there’s a really good description of how to overclock an Apple iMac G4. Unfortunately, their table of resistor positions only holds true for the 167MHz USB 2.0 model iMac and mine is slightly older and has a 133MHz bus.
You can work out the appropriate PLL resistor settings by referring to the datasheet for the MPC7455 (see Table 17: MPC7455 Microprocessor PLL Configuration Example for 1.0 GHz Parts). However, figuring the combinations out can be a bit dizzying, so after working out the settings for 1.27GHz, I figured out the rest just in case I needed them in the future.
‘R’ = resistor present, ‘-’ = no connection.
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