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3 Things to Know About the iBook G3 Clamshell's 576MB RAM Limit

  1. The maximum RAM is 576MB, not 640MB or 1GB. This odd number comes from combining 64MB soldered to the logic board with a single user-accessible SO-DIMM slot.

  2. Only one RAM slot is available for upgrades. The slot accepts a 512MB PC100 module, which is the largest compatible stick you can install.

  3. The 576MB ceiling is real and cannot be exceeded. No combination of modules or tricks will push the iBook G3 Clamshell past this hardware-imposed limit.

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