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Overclock iBook
Par Vincent (ch-vox)
Notez que les informations ci après ne sont pas indiquées comme modèle de stabilité.
Il est important de savoir que toute modification de votre Mac est réalisée à vos propres risques.
Pour contrôler la vitesse horloge du processeur des premiers iBook, il faut repérer sur la carte mère de ce ceux-ci les résistances R7 à R14 situées juste au dessus du processeur (indiqué CPU).
Ce sont ces résistances qui contrôlent le coefficient multiplicateur de l’horloge PLL (Phase-Locked Loop).
1. Il faut donc commencer par isoler la carte mère de l’iBook :
2. Emplacement des résistances
Maintenant on peut repérer le module système, et l’emplacement des résistances, juste au dessus du processeur (rectangle rouge) :
3. Table de correspondance
Le tableau ci-dessous vous indique à quel coefficient correspondent les séries de résistances :
| Fréquence CPU | PLL Config | R13 | R11 | R9 | R7 | R14 | R12 | R10 | R8 | Note |
| 300 MHz | x 4,5 | S | S | S | x | x | x | x | S | config. par défaut |
| 333 MHz | x 5 | S | S | x | S | x | x | S | x | |
| 366 MHz | x 5,5 | S | x | x | S | x | S | S | x | |
| 400 MHz | x 6 | S | x | S | S | x | S | x | x | |
| 433 MHz | x 6,5 | S | x | S | x | x | S | x | S | |
| 466 MHz | x 7 | x | S | x | x | S | x | S | S | |
| 500 MHz | x 7,5 | S | x | x | x | x | S | S | S | |
| 533 MHz | x 8 | x | x | S | S | S | S | x | x | |
| 666 MHz | x 10 | x | S | S | x | S | x | x | S |
4. Benchmark
BenchMark obtenu sous Système Info de Norton Utilities :
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