Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

OC powerbook

Rabidz

I got a question for you... Since you know a lot about overclocking and stuff.. is it possible to reverse engineer a G4 chip to allow more than 2GB of memory? The schematics for the G4 processor states that 4096MB can be addressed by the memory controller...

Care to give re-programming the memory controller to allow our G4's to address up to 4GB of memory???

If you can do this.. we will all be very appreciated of u.
 
PowerPCMacMan said:
I got a question for you... Since you know a lot about overclocking and stuff.. is it possible to reverse engineer a G4 chip to allow more than 2GB of memory? The schematics for the G4 processor states that 4096MB can be addressed by the memory controller...

Care to give re-programming the memory controller to allow our G4's to address up to 4GB of memory???

If you can do this.. we will all be very appreciated of u.
Click to expand...


Ohhhhhh rabidz just got called out!Sounds like a challenge to me!
 
I haven't been around for a few weeks, but what I've missed most of all are probably the outrageous and totally ignorant posts rabidz7 makes.
 
I'm betting rabidz runs Snow Leopard within VirtualPC via soft-BIOS mod, OS X so slow you can make a pot full of coffee and drink two cups by the time it boots & auto-login launches AppleWorks 6 or MS Word 2008 :D

It boggles the mind of changing the thermal paste on G4s, stock paste was good enough as the processors were fairly cool compared to mobile Pentium III/4. Overclocking is silly, if anyone remembers the Alu PowerBook G4 & iMac G4 processor upgrade via Daystar(native 1.92Ghz & 2Ghz--7447a & 7447b) turned into a bag of hurt as some owners who went for "up to 1.92Ghz" had to underclock for stability. Daystar quickly learned most PowerBook G4 motherboards could only top out at 1.7-1.72Ghz... the few which were stable at 1.75-1.83Ghz were rare. Keep in mind anything above 1.83Ghz sustained while plugged in you'd be draining the battery-power adapter tops out at 65W and Apple designed their notebooks to pull an extra 5-8W via battery under load.

Everybody knows the Alu PowerBook G4 1Ghz-1.5Ghz used the same processors as the Mac mini & iMac G4, those of us with these processors can only top out at 1.42Ghz. The later 1.5-1.67Ghz PowerBook G4s were using the limited yield of stable 7447a before aftermarket upgrade makers got access to higher rated chips--fairly late considering by then the shift to Intel began.

...I think that concludes my weekly visit to this PowerPC town :cool:
 
I overclocked the G4 to 1.67GHz, and it won't boot. Help please. I tried to pop all the PLL resistors and use pencil lead to jump the correct ones. Do I have to wait for the soldering guy to jump the resistors?
 
rabidz7 said:
I overclocked the G4 to 1.67GHz, and it won't boot. Help please. I tried to pop all the PLL resistors and use pencil lead to jump the correct ones. Do I have to wait for the soldering guy to jump the resistors?
Click to expand...

I don't know if pencil lead is going to do it. If you're not comfortable with solder, you could get a circuit writer pen from Radio Shack. Another possibility would be the repair paint for automotive rear window defoggers. It usually comes with an applicator brush in the bottle cap like fingernail polish. It's not as common as it used to be, but I think NAPA still carries it.

Edit: As much as you like to tinker, you really should get a soldering iron. Do an hour or two of Google research to get a feel for the basics. Then practice on an old non-working board for a couple of hours and you'll teach yourself the skills that you need to do this correctly. Soldering is no more tedious than a Circuit Writer Pen or conductive paint.
 
Last edited:
rabidz7 said:
I overclocked the G4 to 1.67GHz, and it won't boot. Help please. I tried to pop all the PLL resistors and use pencil lead to jump the correct ones. Do I have to wait for the soldering guy to jump the resistors?
Click to expand...

No, you didn't overclock it yet ;)
Why you've tried this if you can't solder?
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back