G.SKILL Ripjaws X Series 4GB (2 x 2GB) DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBXL - Newegg.com
G.SKILL Ripjaws X Series 16GB (4 x 4GB) DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9Q-16GBXL - Newegg.com
G.Skill Ripjaws X Series 16 GB (2 x 8 GB) 240-Pin SDRAM (PC3-12800) DDR3 1600 CL10-10-10-30 1.50V Dual Channel Desktop Memory Model F3-12800CL10D-16GBXL at Amazon.com