- iMac ClockUp -

I borrowed this page from a now defunct Japanese web site. I have tried this on some of the older systems with only one step up. After doing this I realized that someone with extraordinary soldering skills and good equipment would want to attempt this. I do use the same trace pens that I use on the G4 systems. Do this at your own risk. You can easily muck up your computer.

INTRODUCTION...

I analyzed how to increase the clock speed of a iMac.

If you adjust the set of Resistors labeled "R117" to "R124" which are under side of "System Module", you may configure the Processor clock PLL.

First : You need to take out Logic Board Assembly, and remove "System Module" from "I/O Board".


Second : Configure the set of Resistors labeled "R117" to "R124" which are under side of "System Module".



This information is not confirmation of stability operation.
Please note that any modifications you make to your Macintosh are made at your own risk.

 

TUNE-UP METHOD...

CPU Clock
PLL Config
R117
R118
R119
R120
R121
R122
R123
R124
Note
233 MHz
x3.5
x
S
S
S
S
x
x
x
DEFAULT
266 MHz
x4
x
S
x
S
S
x
S
x

300 MHz
x4.5
S
S
S
x
x
x
x
S


CPU Clock
PLL Config
R117
R118
R119
R120
R121
R122
R123
R124
Note
333 MHz
x5
S
S
x
S
x
x
S
x

366 MHz
x5.5
S
x
x
S
x
S
S
x

400 MHz
x6
S
x
S
S
x
S
x
x

433 MHz
x6.5
S
x
S
x
x
S
x
S

466 MHz
x7
x
S
x
x
S
x
S
S

500 MHz
x7.5
S
x
x
x
x
S
S
S

533 MHz
x8
x
x
S
S
S
S
x
x

Need help with your Mac? Read Bob's Mac Tech Tips

Need help with your G4 hardware? Try Power-Mac-G4.com

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