3200MHz vs. 3600MHz vs. 4000MHz | Best RAM for Ryzen 5000? - YouTube
Thermaltake TOUGHRAM RGB DDR4 4000MHz 16GB (8GB x 2) 16.8 Million Color RGB Alexa/Razer Chroma/5V Motherboard Syncable RGB Memory R009D408GX2-4000C19A at Amazon.com
Corsair Vengeance RGB PRO SL 64GB (2x32GB) DDR4 4000MHz C18 Optimized for AMD Ryzen Desktop Memory (10 Ultra-Bright RGB LEDs, Custom Performance PCB, Tight Response Times, Intel XMP 2.0) Black at Amazon.com
G.Skill Trident Z RGB Series 32GB (2 x 16GB) 288-Pin SDRAM DDR4 4000 (PC4-32000) CL18-22-22-42 1.40V Dual Channel Desktop Memory Model F4-4000C18D-32GTZR at Amazon.com
AMD & Its Board Partners Discuss Ryzen 5000 Zen 3 CPU Undervolting, Memory / Overclocking & 500 Series AGESA Support