Silicon Power DDR3 16GB (2 x 8GB) 1600MHz (PC3 12800) 240-pin CL11 1.35V / 1.5V Unbuffered UDIMM PC Computer Desktop Memory Module Ram Upgrade at Amazon.com
Samsung 4GB DDR3 PC3-12800 1600MHz 204-Pin SODIMM Laptop Memory Module RAM. Model M471B5273DH0-CK0 at Amazon.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