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
OWC 8 GB (2 X 4GB) ram PC8500 DDR3 1066MHz sodimm 204-pin Memory Upgrade Kit, (OWC8566DDR3S8GP), Compatible with MacBook Pro, MacBook, Mac Mini and iMac at Amazon.com
G.SKILL Ripjaws V Series 16GB DDR4 3200 RAM Memory - Newegg.com
CORSAIR Vengeance RGB PRO - DDR4 - 16 GB: 2 x 8 GB - DIMM 288-pin - unbuffered | Dell USA