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Samsung DDR3L RAM 4GB 4 G 1Rx8 PC3L-12800 1600Mhz DIMM PC12800 Laptop Memory Lot | eBay
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com