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HP 4GB DDR4 SDRAM Memory Module - Walmart.com
Samsung ram Memory Upgrade DDR3 PC3 12800, 1600MHz, 204 PIN, SODIMM for 2012 Apple MacBook Pro's, 2012 iMac's, and 2011/2012 Mac Mini's (8GB kit (2 x 4GB)) at Amazon.com
32GB 16GB 8GB 4G DDR3 DDR3L 1866MHz / 1600MHz/ 1333MHz Laptop RAM Samsung LOT UK – ASA College: Florida