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ddr3 dimm 4gb, PNY DDR3 4GB 1333MHz (PC3-10666) CAS 9 1.5V Memory Desktop Module (MD4096SD3-1333) at Amazon.com, Desktop - 240-Pin DIMM: Nanya - 4GB 1333Mhz PC3-10600U 240-Pin DIMM Desktop Memory Ram - CPU Medics