Patriot Viper Steel DDR4 16GB (2 x 8GB) 4000MHz CL 16-16-16-36 UDIMM Low-Latency Gaming Memory Kits - PVS416G400C6K at Amazon.com
Thermaltake TOUGHRAM RGB White DDR4 4000MHz 16GB (8GB x 2) 16.8 Million Color RGB Alexa/Razer Chroma/5V Motherboard Syncable RGB Memory R022D408GX2-4000C19A at Amazon.com
Amazon.com: G.SKILL 16GB (2 x 8GB) TridentZ RGB Series DDR4 PC4-32000 4000MHz Desktop Memory Model F4-4000C17D-16GTZR
Crucial Ballistix MAX RGB 4000 MHz DDR4 DRAM Desktop Gaming Memory Kit 16GB (8GBx2) CL18 BLM2K8G40C18U4BL (Black) at Amazon.com