16GB Kit 2 x 8GB DDR3 PC3-12800 1600 Mhz DESKTOP MEMORY 240 PIN Non-ECC CL 11 at Amazon.com
Amazon.com: Crucial RAM 16GB Kit (2x8GB) DDR3 1600 MHz CL11 Memory for Mac CT2K8G3S160BM : Everything Else
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 Vengeance Blue 16GB (4x4GB) DDR3 1600 MHz (PC3 12800) Desktop Memory 1.5V at Amazon.com
2GB DDR3-1600MHz PC3-12800 204-pin 1.35v 1Rx16 Laptop Memory RAM Module by NEMIX RAM at Amazon.com