Overclocking a Tray-loading iMac G3

The iMac ClockUp page was originally posted at <http://www.bekkoame.ne.jp/~t-imai/imace1.html> and is no longer available there. We have adapted that information for the benefit of those who wish to overclock tray-loading iMacs. The original author is not known to us.

Bondi iMacThis information does not confirm stable operation. Please note that any modifications you make to your iMac are made at your own risk.

I analyzed how to increase the clock speed of an iMac. If you adjust the set of resistors labeled “R117” to “R124”, which are on the underside of the system module, you can configure the processor clock PLL.

First, you need to take out the logic board assembly and remove the system module from the I/O board.

Next, configure the set of resistors labeled “R117” to “R124” that are on the underside of the system module.

Resistor Settings

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
Rev. A & B
266 MHz
x4
x
S
x
S
S
x
S
x
Rev. C
300 MHz
x4.5
S
S
S
x
x
x
x
S
333 MHz
x5
S
S
x
S
x
x
S
x
Rev. D
366 MHz
x5.5
S
x
x
S
x
S
S
x
DANGER!
400 MHz
x6
S
x
S
S
x
S
x
x
DANGER!
433 MHz
x6.5
S
x
S
x
x
S
x
S
DANGER!
466 MHz
x7
x
S
x
x
S
x
S
S
DANGER!
500 MHz
x7.5
S
x
x
x
x
S
S
S
DANGER!
533 MHz
x8
x
x
S
S
S
S
x
x
DANGER!
  • S – mount resistor
  • x – remove resistor

Keywords: #overclockimacg3 #overclocking

Short link: http://goo.gl/Mbl9qW

searchword: overclocktrayloadimac

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