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667mhz Overclocking Modification...
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Fresh-Faced Recruit
Join Date: Apr 2003
Location: Bay Area
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hey everyone,I got hold of a G4 667MHz cpu card from PowerMac. XPC7450 series. I want to put this in my Cube G4 but requires to change the bus speed to 100 instead of 133mhz. Also would like to overclock it to 700 or 800. I haven't found anything on xlr8yourmac.com, does anyone know a source with pictures to help me on this? Thanks.
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Mac Elite
Join Date: Dec 2000
Location: In support of our troops
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You'd have to find the schimatic, I'm not sure where, but I know there is one (look on that japinese guys website, he might have one...) Basically set the muliplyer to 7 and the bus speed to 100, and you should have a 700mhz/100mhz bus  .
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Fresh-Faced Recruit
Join Date: Apr 2003
Location: Bay Area
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I looked and looked...still haven't come across anything, anyone else??? please....
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Senior User
Join Date: Jan 2001
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I don't recall seeing a 667Mhz G4 card(outside of the Powerbooks). Is it an Apple card or an aftermarket card?
Perhaps it's already been overclocked?
It sounds like it should run on a 133 bus not a 100MHz bus.
(i.e.667/133=5x multiplier or 667/100=6.7x multiplier(???))
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"-Dodge This"
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Mac Enthusiast
Join Date: Jan 2002
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Apple released the 667MHz PowerMac. 
They did it for a short while when the announced the 733MHz PowerMac, but nobody bought the 667.
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Fresh-Faced Recruit
Join Date: Apr 2003
Location: Bay Area
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Offline
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Okay, I found the location to change the clock speed (PLL) but I still can't located where to change he bus speed from 133 to 100Mhz...Does anyone else have a clue? Thanks.
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Senior User
Join Date: Feb 2001
Location: The Sunny Isle of Wight
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Senior User
Join Date: Jan 2001
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Originally posted by Peder Rice:
Apple released the 667MHz PowerMac.
They did it for a short while when the announced the 733MHz PowerMac, but nobody bought the 667.
Appparently they did
CubeME,
I still don't understand why you feel a 100MHz is needed instead of the 133 bus.
The G4 667 runs on a 133 bus with a 5x multiplier.
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"-Dodge This"
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Addicted to MacNN
Join Date: Jan 2000
Location: Stoneham, MA, USA
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The G4 Cube has a 100MHz Bus. Just set the multiplier to whatever you want the speed to be and plug in the processor. I'd start with 6..5 to give you 650 MHz just to make sure everything works, then go UP from there as you see fit.
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Junior Member
Join Date: Aug 2002
Status:
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The CPU will run at a multiple of teh bus speed. You cannot change the bus speed with the CPU. The 667 CPU is set to run at 5x the bus speed. So if you put it un the cube unchanged it will run at 500MHz.
-Thomas
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