G.Skill Trident Z RGB Series 16GB (2 x 8GB) 288-Pin SDRAM (PC4-25600) DDR4 3200 CL16-18-18-38 1.35V Dual Channel Desktop Memory Model F4-3200C16D-16GTZR at Amazon.com
HP 8GB DDR4 SDRAM Memory Module - 8 GB - DDR4 SDRAM - 2666 MHz DDR4-2666/PC4-21333 - ECC at Amazon.com
Patriot Signature Line Series DDR4 16GB (1 x 16GB) 3200MHz SODIMM (1 Rank Single-Sided Module) at Amazon.com