G.Skill Trident Z Royal Series [Silver] 16GB (2 x 8GB) 288-Pin SDRAM (PC4-25600) DDR4 3200 CL16-18-18-38 1.35V Dual Channel Desktop Memory Model F4-3200C16D-16GTRS at Amazon.com
How Dual Channel Works With 3 8GB RAM Sticks? : r/PCHardware
parts-quick 8GB Memory for Dell OptiPlex 3050 SFF/Tower DDR4 2400MHz Dual- Channel Non ECC SDRAM DIMM at Amazon.com
8GB Memory for Dell OptiPlex 3050 SFF/Tower DDR4 2400MHz Dual-Channel Non ECC SDRAM DIMM (MemoryMasters) - Walmart.com
Mushkin Essentials – DDR4 Desktop DRAM – 32GB (2x16GB) UDIMM Memory Kit – 2933MHz (PC4-23400) CL-21 – 288-pin 1.2V PC RAM – Dual-Channel – Low-Voltage – (MES4U293MF16GX2) at Amazon.com