Overclocking an ALU 15" PowerBook

rabidz7

macrumors 65816
Original poster
Jun 24, 2012
1,203
2
Ohio
Today I found this.
It shows how to give a powerbook more voltage, and increase the clock.
 
Last edited:

zackkmac

macrumors 6502a
Jul 7, 2008
737
37
Tulsa
Cool! If I knew how to solder and how to determine what voltage to change it to, it would be cool to bring my 1.67GHz to 1.92GHz or 2.0GHz. Unless it would render it unusable.
 

Nameci

macrumors 68000
Oct 29, 2010
1,944
8
The Philippines...
I'll pass, I am on my PB 1.67 HR. It's quite fast and stable, seldom would I hear that the fans kick in, I don't see a need for me to OC it.

Nice find though.
 

MrPilot

macrumors 6502
Apr 30, 2013
315
20
I'll pass, I am on my PB 1.67 HR. It's quite fast and stable, seldom would I hear that the fans kick in, I don't see a need for me to OC it.

Nice find though.
Have the same one. Was thinking the same as you
 

Nameci

macrumors 68000
Oct 29, 2010
1,944
8
The Philippines...
I just love my PowerBook. I stick with the old apps. I think the old apps works great. For word processing which what the most that I do today, making equipment user's manual, diagnostic manuals and sorts, the old Appleworks is great. Not so graphics heavy and way, way much fluid than Pages or Word for Mac. I don't miss the newer apps at all.

The memory footprint of Leopard is also smaller compared to Lion or ML. For the things I do on this notebook, the horsepower is more than enough. So there is no sense for me overclocking it, with so little to gain except for the bragging rights. I want it cool and quiet.
 

rabidz7

macrumors 65816
Original poster
Jun 24, 2012
1,203
2
Ohio
I attempted this on my 12", but OS X still shows the speed at 1.5 GHz.
I used a pencil to jump two contact points on the rear board, which should have brought the speed to 1.58GHz; could the reason that did not work be that the CPU is the 7447A, and not compatible as it said on macxtrem? I jumped the resistor based on a hunch that it is the MSB_PLL.

ImageUploadedByTapatalk1371595173.662574.jpg

The jumped resistor is the grey one to the right.
 

spunkgarLEWII

macrumors regular
Jun 1, 2013
100
0
Me personally, I would have to agree with Nameci.. I wouldn't bother.. 1.67 Ghz is fast enough for my needs.. No need to bother with micro soldering.. if Rabidz7 wants to do this let him do it.. but personally, its not going to make a difference.

1.67 to 1.8 is only about 10 percent or less difference.. a PATA SSD would be a much better choice.

----------

Hey GermanyChris!

Long time no hear.. Has the Mac Pro forum been too much for ya? Welcome back to PowerPC, Dude! I like your iCan avatar..

Still love my cheese grater 6-core.. but love my PPC machines much more.


Good Job!
 

wobegong

Guest
May 29, 2012
418
1
Me personally, I would have to agree with Nameci.. I wouldn't bother.. 1.67 Ghz is fast enough
Agree - the Daystar 2.0Ghz 'upgrade' for the PB 1.67 was fraught with overheating issues so to my mind that more or less proves it's a bad idea. Your main bottleneck on a late G4 is memory bus bandwidth (166Mhz).
 

Nameci

macrumors 68000
Oct 29, 2010
1,944
8
The Philippines...
Agree - the Daystar 2.0Ghz 'upgrade' for the PB 1.67 was fraught with overheating issues so to my mind that more or less proves it's a bad idea. Your main bottleneck on a late G4 is memory bus bandwidth (166Mhz).
You can only do so much on the processor and then you'll be frying it. And even if you reached your theoritical speed, wobegong is right about the bottleneck on the RAM speed. It is lying trying to force a gallon of water on a 3/8" tube. Not so good.

----------

Once again, I have ditched my core 2 duo macbook for my 1.67 PB HR/DLSD. Keyboards are awesome, just awesome, hires screen. For the things that I do in the office the horsepower is just enough.

I am not even using the crap that is MSWord. Appleworks all the way baby, much more fluid and intuitive, minus all the eye candy. Stuff for serious writing.

To the OP just keep the emac, boot it once in a while just to charge the PRAM battery. Who knows it might be iconic someday and you can sell it double of what you bought it.
 

GermanyChris

macrumors 601
Jul 3, 2011
4,185
2
Here
Me personally, I would have to agree with Nameci.. I wouldn't bother.. 1.67 Ghz is fast enough for my needs.. No need to bother with micro soldering.. if Rabidz7 wants to do this let him do it.. but personally, its not going to make a difference.

1.67 to 1.8 is only about 10 percent or less difference.. a PATA SSD would be a much better choice.

----------

Hey GermanyChris!

Long time no hear.. Has the Mac Pro forum been too much for ya? Welcome back to PowerPC, Dude! I like your iCan avatar..

Still love my cheese grater 6-core.. but love my PPC machines much more.
I've always hung out in both places they're not mutually exclusive
 

HuskyWRS

macrumors newbie
Jul 20, 2013
1
0
@rabidz7:
I have a 12" 1,5ghz last revision powerbook and want to overclock it also.
Please post/message me if you succeed.
I still wait for parts so I can do all my planned mods at once.

Meanwhile take a look here, maybe this forum/user can help us.

http://www.cubeowner.com/forums/index.php?showtopic=14765
this guy succeeded overclocking his 1,5ghz 12" to 1,67ghz by just moving some jumpers.

My guess is that you could actually overclock it more if you would solder sth and do sth with voltage.

Why yours still shows 1,5 i do not know but maybe you should have done it to 1,67.

someone commented this on the other forum of your first link:
" .......
1.75Ghz wasn't stable anymore and crasht the system. 1.67Ghz works great!
Good luck to all of you who's gonna do it as well
Gamoul! - 30/10/2005

1.75 can't work because it is a decimal multiplier, but you can try 1.83."


hope you succeed soon and I will need some help soon also cause I do not know know yet which jumpers should be moved to where...