MC243G/A Certified RAM for Apple 4 GB kit (2 x 2 GB) DDR3 1066MHz 204-Pin So-dimm

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Made from the highest quality components, ARCH MEMORY memory modules are designed to increase productivity and help your computer work faster. Arch Memory products are engineered to meet industry standard specifications and rigorously tested to ensure quality. Backed by a lifetime warranty and legendary reliability, Arch Memory RAM is your best choice for upgrading your computer's memory.