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4GB PC10600 DDR3 1333MHz SO-DIMM Memory Compatible with 2011 MacBook Pro, Mid 2010/2011 21.5" & 27" iMac Models, 2011 Mac Mini (OWC1333DDR3S4GB) at Amazon.com
Tecmiyo 4 Gb Ddr /ddr3 1333 Mhz Udimm Pc 3-10600u 1.35 V / 1.5 V Cl11 240 Pin 2rx8 Upgrade Module For Unbuffered Desktop Computer Memory With Two Ranks Without Ecc Gift