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Silicon Power Hynix IC Compatible for Apple DDR3 DDR3L 16GB (2 x 8GB) RAM 1600MHz (PC3 12800) 204 pin CL11 1.35V Non ECC Unbuffered SODIMM Laptop Notebook Memory RAM Module Upgrade at Amazon.com
parts-quick 4GB Memory for Gigabyte P57W-1060-602S Notebook DDR4 2133MHz SODIMM Compatible RAM at Amazon.com