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
Dataram 64GB (4 X 16GB) DDR3 PC3-14900 1866MHz ECC Registered Memory RAM for MAC PRO Late 2013 at Amazon.com
Dataram 64GB (4 X 16GB) DDR3 PC3-14900 1866MHz ECC Registered Memory RAM for MAC PRO Late 2013 at Amazon.com
Crucial Technology 16GB DDR3-1866 / PC3 14900 RDIMM ECC Server Memory RAM (CT16G3ERSDD4186D) at Amazon.com