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The PowerBook G4 17" can be upgraded to 2GB by adding a 1GB memory module to the open socket and replacing the 512MB memory module in the remaining socket with a 1GB memory module.

Standard Memory
512MB Removable
Maximum Memory
2GB
Memory Expansion (No. of sockets)
2 Expansion Sockets
Memory Expansion
Install 1 at a time
Memory Sizes
256MB | 512MB | 1GB
Memory Speed (Type)
PC2700


Note that the 1.67GHZ 17" Hi-Res, model A1139, uses PC2-4200 Ram, all other models use PC2700 Ram.

Aluminum G4 Powerbook Memory Upgrade (17" Models)