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The 4GB DDR2 800 MHz SO-DIMM Memory Module is designed for use with Apple's MacBook (Mid 2009) and iMac (24" and 20" Early 2008) models, and is also compatible with certain Intel/AMD-processor-based PC laptops. The module fully meets Apple's specifications, with special attention to proper thermal specifications, and is also fully compliant with JEDEC specifications. These are non-ECC, non-parity, dual rank modules that have a CAS latency of 6.