HP 16GB PC3-12800 DDR3-1600 2Rx4 1.5v ECC Registered RDIMM (HP PN# 672612-081) at Amazon.com
Kingston Technology 16GB Non-ECC CL11 DIMM 1600MHz DDR3 RAM (KVR16N11K2/16) - Kit of 2 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
G. Skill Ripjaws X series 16 GB (4x4) SDRAM DDR3-1600 | eBay