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: Corsair CMY16GX3M2A2400C11R Vengeance Pro 16GB (2x8GB) DDR3 2400MHz PC3 19200 Desktop RAM, Red 1.65V : Cell Phones & Accessories
Corsair Vengeance Pro Series 16GB (2x8GB) DDR3 1600 MHZ (PC3 12800) Desktop Memory 1.5V, Black at Amazon.com
Amazon.com: Corsair CMY16GX3M2A2400C11R Vengeance Pro 16GB (2x8GB) DDR3 2400MHz PC3 19200 Desktop RAM, Red 1.65V : Cell Phones & Accessories