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The 24GB DDR3 1333 MHz SO-DIMM Memory Kit (2 x 4GB + 2 x 8GB, Mac) from OWC is designed for select iMac models, and is also compatible with certain Intel/AMD processor-based PC laptops. These modules are dual rank, non-parity, non-ECC, and have a CAS latency of 9. They fully meet Apple's specifications and are fully compliant with JEDEC specifications, document JESD79-3B. They are also RoHS certified.