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Expand the RAM memory of your MacBook Pro, iMac, and Mac mini with the 4GB DDR3 1333 MHz SO-DIMM Memory Module from OWC/Other World Computing. This memory module is a non-ECC, unbuffered, dual rank module that operates on 1.5V. The module fully meets Apple's specifications, is fully compliant with JEDEC specifications, and is RoHS certified.