G.SKILL Ripjaws X Series 8GB (2 x 4GB) DDR3 2400MHZ Desktop Memory Model F3-2400C11D-8GXM
G.Skill F3-1600C9D-16GXM Ripjaws X Series 16GB 240-Pin DDR3 SDRAM 1600 Desktop Memory Model - Walmart.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
Amazon.com: G.SKILL F3-17000CL9D-8GBXM RipjawsX Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2133 (PC3 17000) Desktop Memory : Electronics