Crucial RAM 16GB DDR4 3200MHz CL22 (or 2933MHz or 2666MHz) Laptop Memory CT16G4SFRA32A at Amazon.com
Kingston 16GB ECC REG DR DDR4 2666MHZ (KTD-PE426D8/16G) at Amazon.com
G.Skill Ripjaws V Series 16GB (2 x 8GB) 288-Pin SDRAM (PC4-19200) DDR4 2400 CL15-15-15-35 1.20V Dual Channel Desktop Memory Model F4-2400C15D-16GVR at Amazon.com