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If this is a Powerbook G4 1.33 17", it requires DDR PC2700 RAM, no other. Furthermore, this machine uses processor-slewing when it goes into energy save, and you can take for granted that any standard PC2700 chip is NOT slewing-compatible and will crash the machine . Stick with the Samsung genuine chip for this machine, (and the 1.0 17" and the 1.0 and 1.25 15"). In the USA a good source is Data Memory Systems
 
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