Overclocking and voltage modding G4 "Digital Audio"

I received 733MHz G4 Digital Audio -machine for free, I did small upgrade from 256MB of ram to 1GB and also swapped original Radeon 32MB PCI to Radeon 8500 64MB AGP. Next thing I did was to overclock it to 867MHz which seems to work fine, I needed to cut one resistor and solder one connection. As 1GHz frequency was easy to test, I did solder a connection which sets that speed, I can get the start-up tone but no picture on screen. I remove the solder connection so machine is again functional.
Is there any way of increasing core voltage and possible make the chip to work at 1GHz ? L3 cache speed is not problem since according to what is printed on the cache chip Samsung promises that L3 will work up to 250Mhz and because it work 1/4 of the core voltage it is now running at 217Mhz when at 867MHz. PowerPC 7450 core has been used in 1GHz machines by Apple so in theory this chip could work at 1GHz. I re-applied thermal paste to make sure heat gets transfered properly and the heat sink does not seems to run that hot, I donät know if it is standard for 733Mhz Digital Audio -machines but mine has additional processor fan and sort of plastic cover installed on top of the heatsink which I think "wraps" the heat around so the fan can then remove it effectively.. Don't know if I explained it well enough, sorry about my english
Interesting thing is that in overclocking I referred to Quicksilver instructions, on some sites the picture of the Digital Audio's processor module/card does not match mine.
Is there way to increase voltage? Yes, I know this machine is slow no matter what but it was free and it is just a fun project.
Message was edited by: thewk

Okay I will try those later when I have possibility.
I have now tested further this chip at 867MHz, before I didn't have decent hard drive to install Mac OS X. However the machine works just fine in OS X, I have tested Xbench, Geekbench and general usage including Flash which is actually great benchmark since it is so CPU intensive on PPC. I did also test Ubuntu's benchmark which included FPU tests and similar, works fine.
Xbench identified this chip as PowerPC 7450 V'gor v. 2.0 so this is a second revision of 7450, how well these usually overclock, do you know?
Message was edited by: thewk

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