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The 16GB DDR3 1333 MHz SO-DIMM Memory Kit from OWC / Other World Computing consists of four 4GB modules, for a total of 16GB. It is designed for iMac models, and is also compatible with certain AMD/Intel process-based PC laptops. These SO-DIMMs are non-parity, non-ECC, and dual ranked and run on 1.5V. They are compatible with systems that have available 204-pin slots. For performance, the chips operate on a CAS latency of 9 and have a 1333 MHz frequency. The memory modules fully meet Apple's specifications and is fully compliant with JEDEC specifications. It is also RoHS certified.