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The 16GB iRAM DDR3 1333 MHz SO-DIMM Memory Kit (4 x 4GB) from Mushkin helps increase the speed of your computer by providing four 4GB modules of DDR3 memory. Increasing your computer's RAM enables more applications to run simultaneously and helps reduce lag. Short-Outline DIMMs (SO-DIMMs) are primarily used in notebooks, but are also compatible with certain computers with small or unique form factors. This product is compatible with certain Mac computers.