Patriot Viper 3 Series, Black Mamba, DDR3 8GB (2 x 4GB) 1600MHz Dual Channel Kit (PV38G160C9K) at Amazon.com
G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model (F3-12800CL9D-8GBRL) 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
Crucial 4GB Single DDR3-1600 (PC3-12800) SODIMM 204-Pin High Density Memory CT51264BF160BJ at Amazon.com