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Chipping the Quadra
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.
Quadra 650
The Quadra 650 has a 16.67 MHz oscillator which runs the processor at 33.33 MHz. The max oscillator you can replace it with while keeping the serial ports functional is 22 MHz, to run the processor at 44 MHz. If you don't need to use the serial ports, you can put in a 24 MHz oscillator, to run the processor at 48 MHz. With an Apple PPC card installed, the max oscillator you can use is 19.6992 MHz, to run the 68040 at 39.3984 MHz, and the PPC card at 78.7968 MHz.
Quadra 700
The Quadra 700 has a 50 MHz oscillator which runs the processor at 25 MHz. The max oscillator you can replace it with is 74 MHz, to run the processor at 37 MHz.
Quadra 800
The Quadra 800 has a 16.67 MHz oscillator which runs the processor at 33.33 MHz. The max oscillator you can replace it with while keeping the serial ports functional is 21 MHz, to run the processor at 42 MHz. If you don't need to use the serial ports, you can put in a 24 MHz oscillator, to run the processor at 48 MHz. With an Apple PPC card installed, the max oscillator you can use is 19.286 MHz, to run the 68040 at 38.572 MHz, and the PPC card at 77.144 MHz.
Quadra 840av
The Quadra 840av has a 20 MHz oscillator which runs the processor at 40 MHz. The max oscillator you can replace it with is 24 MHz, to run the processor at 48 MHz.
Quadra 900
The Quadra 900 has a 50 MHz oscillator which runs the processor at 25 MHz. The max oscillator you can replace it with is 74 MHz, to run the processor at 37 MHz.
Quadra 950
The Quadra 950 has a 67 MHz oscillator which runs the processor at 33 MHz. The max oscillator you can replace it with is 92.9405 MHz, to run the processor at 46.47025 MHz. With an Apple PPC card installed, the max oscillator you can use is 80 MHz, which will run the 68040 at 40 MHz and the PPC card at 80 MHz.
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