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Chipping the QuadDoubler
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.
Sonnet QuadDoubler Speedup
The Sonnet QuadDoubler is placed in the 68040 socket and runs at twice the bus speed of the computer. There were two versions, one with a 40 MHz 68040 on it (meant for the Centris 610), and one with a 50 MHz 68040 on it (meant for any 25 MHz 68040 computer).
You may be able to get the 40 MHz QuadDoubler to 50 MHz by clock chipping the Centris 610 itself to 25 MHz. You may need a fan, and you may also not be able to get it quite that fast.
As far as the 50 MHz QuadDoubler, you can probably only get a few extra MHz out of it. I don't expect it to get past perhaps 55 MHz.
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