Ursprünglicher Beitrag von: Ben Eisenman ,
Hello! The CPU is integrated into the logic board, so it would be necessary to replace the entire logic board in order to upgrade. If your machine has the model number A1106 (written in the small print on the bottom of the machine near the hinge), you can use any of the logic boards [http://www.ifixit.com/Mac-Parts/PowerBook-G4-Aluminum-15%22-1.5-1.67-GHz#0-Logic+Boards|here]. Good luck!