TOUGHRAM RGB Memory DDR4 4000MHz 16GB (8GB x 2) White
G.SKILL 16GB (2 x 8GB) TridentZ Series DDR4 PC4-32000 4000 MHz 288-Pin Intel Z270 / Z370 Memory (Desktop Memory) Model F4-4000C18D-16GTZSW at Amazon.com
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
G.Skill Trident Z RGB Memory Module 32 GB DDR4 4000 MHz at Amazon.com