You can pick up 16GB or 32GB DDR4 RAM sets pretty cheap right now | PC Gamer
G.Skill Trident Z RGB Series 16GB (2 x 8GB) 288-Pin SDRAM (PC4-28800) DDR4 3600 CL17-18-18-38 1.35V Dual Channel Desktop Memory Model F4-3600C17D-16GTZR at Amazon.com
Corsair Vengeance LPX 16GB (2x8GB) DDR4 DRAM 3200MHz C16 Desktop Memory Kit - Black (CMK16GX4M2B3200C16) at Amazon.com