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Overclocking Your Vintage Mac

Overclocking First Generation Power Macs

LEM Staff - 2014.09.16

Some of the first generation Power Macs can be significantly boosted by overclocking their CPUs.

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. Modifications are done at your own risk.

Be sure to visit The Clock Chipping Home Page, the definitive resource on chipping the Mac.

Power Macintosh 6100Power Mac 6100/60 and  Performa 611x

The Power Mac 6100/60 (a.k.a. Performa 611x) has a 30 MHz oscillator that runs the CPU at 60 MHz. The fastest oscillator you may be able to replace it with is 42 MHz, which will run the processor at 84 MHz, although a 40 MHz oscillator and 80 MHz CPU speed is more likrel. At 60 MHz, the Gestalt is 75, at 66 MHz it is 100, and at 80 MHz it is 101.

Power Mac 6100/66

The Power Mac 6100/66 has a 33 MHz oscillator to run the processor at 66 MHz. The max oscillator you can replace it with is 42 MHz, to run the processor at 84 MHz. At 60 MHz, the Gestalt is 75, at 66 MHz it is 100, and at 80 MHz it is 101.

Power Macintosh 7100Power Mac 7100/66

The Power Mac 7100/66 has a 33 MHz oscillator that runs the processor at 66 MHz. The fastest oscillator you can use in the 7100/66 is 42 MHz, to run the processor at 84 MHz. At 66 MHz, the Gestalt is 112, and at 80 MHz it is 113.

Power Mac 7100/80

The Power Mac 7100/80 has a 40 MHz oscillator to run the CPU at 80 MHz. The fastest oscillator you can use in the 7100/80 is 43 MHz, to run the processor at 86 MHz.

Quadra 800Power Mac 8100/80

The Power Mac 8100/80 has a 40 MHz oscillator that runs the processor at 80 MHz. The highest speed oscillator you can use in the 8100/80 is 48 MHz, to run the processor at 96 MHz.

Power Mac 8100/100

The Power Mac 8100/100 has a 33.33 MHz oscillator to run the processor at 100 MHz. The maximum oscillator you can use in a 8100/100 is 42.9545 MHz, to run the processor at 128.8 MHz.

Power Mac 8100/110

The Power Mac 8100/110 has a 36.667 MHz oscillator to run the processor at 110 MHz. The top speed oscillator you can use in the 8100/110 is 45 MHz, to run the processor at 135 MHz.

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