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
Corsair CMK8GX4M1A2666C16 Vengeance LPX 8GB (1x8GB) DDR4 DRAM 2666MHz (PC4-21300) C16 Memory Kit - Black at Amazon.com
Amazon.com: Corsair CMY16GX3M2A2400C11R Vengeance Pro 16GB (2x8GB) DDR3 2400MHz PC3 19200 Desktop RAM, Red 1.65V : Cell Phones & Accessories