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The 1GB DDR 266 MHz SO-DIMM Memory Module (Mac) from OWC / Other World Computing is designed for select PowerBook G4, iBook G4, and iMac models, and is also compatible with certain Intel/AMD process-based PC laptops. This module meets or exceeds Apple's specifications, is fully compliant with JEDEC specifications (document JESD79-3B), and has a CAS latency of 2.5.