Lenovo SDRAM 16 DDR4 (PC4 2133) 4X70G78062 at Amazon.com
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
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Crucial 16GB (2 x 8GB) 260-Pin DDR4 SO-DIMM DDR4 3200 (PC4 25600) Laptop Memory Model CT2K8G4SFRA32A - Newegg.com
Kingston Technology 16GB DDR4 2133MHz Reg ECC DIMM Memory for Select Cisco Servers (KCS-UC421/16G) (PC4 2133) at Amazon.com