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Chipping the PowerBook
Many Mac models can be "chipped" to run at a higher speed. These pages provide information on the maximum reliable speed. This may vary from one machine to the next. Chipping is not authorized by Apple. Any modifications you perform on your Mac may damage it and will void any warranty. Modifications are done at your own risk.
Be sure to visit Marc Schrier's Clock Chipping Home Page, the definitive resource on chipping the Mac.
PowerBook 145
The PowerBook 145 has a 50 MHz oscillator which runs the processor at 25 MHz. The max oscillator you can replace it with is 70 MHz, to run the processor at 35 MHz.
PowerBook 150
The PowerBook 150 has a 67 MHz oscillator which runs the processor at 33 MHz. The max oscillator you can replace it with is 86 MHz, to run the processor at 43 MHz.
PowerBook 160
The PowerBook 160 has a 50 MHz oscillator which runs the processor at 25 MHz. The max oscillator you can replace it with is 67 MHz, to run the processor at 33 MHz.
PowerBook 170
The PowerBook 170 has a 50 MHz oscillator which runs the processor at 25 MHz. The max oscillator you can replace it with is 70 MHz, to run the processor at 35 MHz.
PowerBook 180
The PowerBook 180 has a 67 MHz oscillator which runs the processor at 33 MHz. The max oscillator you can replace it with is 74.25 MHz, to run the processor at 37.125 MHz.
PowerBook 520 and 520c
The PowerBook 520 and 520c have a 12.5 MHz oscillator which runs the processor at 25 MHz. The max oscillator you can replace it with is 22.5 MHz, to run the processor at 45 MHz.
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