G.Skill Trident Z NEO 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-32GTZN 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