8GB 2 X 4GB DDR2 PC2-6400 800MHZ 240Pin AMD DIMM Hgih Density Desktop Memory at Amazon.com
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com