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4gb ram ddr3 1333mhz dual channel, Samsung 4GB DDR3 Unbuffered SODIMM 4GB DDR3 1333MHz Memory Module Memory Module (DDR3, Laptop, 204-pin SO-DIMM, 2 x GB, SO-DIMM, 512Mx64) at Amazon.com, 4GB G.Skill DDR3 PC3-10600 NS Dual kit