Mid-05 12" iBook G4/1.33 CPU PLL Resistors?

John8520

Well-known member
I have a few of these iBook G4s, and I'd like to take a swing at overclocking them a smidge (or underclocking for better battery life, perhaps?)

I found this forum post from 2010 regarding an 800Mhz iBook G4 overclock, but this model does not have PLL resistors in the same place. Below is a photo of the under-CPU region of one of the boards in question, where I would expect to find such resistors. I have yet to find a schematic for this board, but that would quickly answer the question.

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Ncc74656

Well-known member
did you figure this out? i dont see anything in that photo that looks like a resistor bank for the VRM's. might be on the other side of the board? i have a 1.42 ibook and i did find that forum you are refrencing but all the photos are down. you dont have htem do you?
 

alectrona6400

Well-known member
I might actually have spotted a difference between the two boards but I don't really have access to a spare board anymore... I do like the idea of getting the FSB clocked to 167MHz though, as the 2005 iBooks only run at 133MHz for the 12" board and 142MHz for the 14".
 

Ncc74656

Well-known member
i have hte 14. ive clocked the G4's up. id have to dig into this to try and find hte right resistors.
 

John8520

Well-known member
did you figure this out? i dont see anything in that photo that looks like a resistor bank for the VRM's. might be on the other side of the board? i have a 1.42 ibook and i did find that forum you are refrencing but all the photos are down. you dont have htem do you?
Nope, never got around to figuring it out. The archive.org link for that forum post includes the photos:


Might be worth reaching out to dosdude1 - he may have schematics for later iBook G4s.
 
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