I know I'd be insane to try it, but might anyone know how to locate the PLL resistors on a Titanium PowerBook G4 1GHz? I've disassembled the machine but have been unsuccessful in locating the appropriate area on the logic board.

I've reviewed Motorola's PowerPC 7455 documentation but it didn't provide any assistance in locating the clock: http://e-www.motorola.com/files/32bit/doc/data_sheet/MPC7455EC.pdf

I've also reviewed Marc Schrier's excellent page on overclocking a Dual Quicksilver 1Ghz: http://homepage.mac.com/schrier/pmg4_1000_1200.html

I was successful in overclocking my Pismo years ago and, more recently, my G4 Cube. Yes, I know, 1066MHz or 1200MHz will likely cook the machine immediately. Call me crazy.

Thanks!

Post edited by: boodle, at: 2004/07/28 17:51

I've found a site in Japanese which once detailed overclocking a PowerBook G4 800Mhz to 866Mhz. This would be valuable info but the page seems to be missing: http://village.infoweb.ne.jp/~fwid8843/NewPBG4/NewPBG4.html

Doing a search for "PLL" or "866" in his weblog yields additional info on the jumper settings, but I can't read Japanese, unfortunately: http://village.infoweb.ne.jp/~fwid8843/index/diary.cgi

I'm game for trying to do a traceback using the processor specs as a guide, but I'm not sure where to start.

Also took a look at http://www.voelker.com/service/void.php, but the 1GHz and 500MHz logic boards are significantly different.

Post edited by: boodle, at: 2004/07/28 16:25

I think this might be the area in which the clock and bus speed resistors are located. Can anyone confirm? This is a photo of the top left corner with the bottom case removed.

Post edited by: boodle, at: 2004/07/28 17:42

can you get a shot of the upper-left side of the board (from the perspective of sitting in front of it)?

Sure thing. I'll document the entire logic board when I take it apart next time.

i saw some shots for an older 500mhz g4 powerbook, but the design is different enough to need another look. everything is paired up. unfortunatly it looks like the right area, but without the whole layout, it can be difficult. i'm glad you are going all the way and overclocking your powerbook. very few people would do that, and that's dedication. looking foward to seeing the pic(s)

I don't know if this will help or not, but Sherlock has a language converter, useing C/P (Command C, Command V) you can take each paragraph out of the Japenese website, and convert it roughly to english. It should give the help you need....

Tho you might have already done this... GOOD LUCK!

Hot off the presses! :ohmy:

"Here an article which will explain you how overclock a Titanium DVI. You will also see how increasing the voltage to improve stability."

Original article in French:
http://mackmania.free.fr/articles.php?article=11

Google translation to English:
http://translate.google.com/translate?u=...Flanguage_tools

I may give this a whirl tonight.

Post edited by: oojacoboo, at: 2004/08/13 04:42

this user deserves some major karma points for that one!

Thanks for the karma, whitlock.

First, the good news: the PLL clock table is correct. sysctl hw.frequency will give me the correct number after a power manager reset. Currently at 1.13GHz.

Now the bad news: soldering the voltage control is very touchy. I'm currently getting inconsistent readings from 1.22v to 1.52v. This may have something to do with the L2 cache being permanently disabled. The machine is now in "low power" mode for some reason. What does this mean for our hero? Well, it means his 1GHz Titanium with 1MB of L2 cache is now stuck at 667MHz with no L2 cache. Not exactly what I had in mind. Hopefully, this is a simple case of me screwing something up with the voltage soldering and not an issue with the mod instructions. I've tried various iterations of both the clock and the voltage control but nothing seems to bring back the L2.

Be warned! This is a very difficult mod and should not be taken lightly!

P.S. Most of the voltage control resistors are 470k ohms.

Post edited by: boodle, at: 2004/08/16 10:41