CMS 32GB (2X16GB) DDR4 19200 2400MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Asus/Asmobile® Prime X470-PRO, Prime Z390-A, Prime Z390-P, WS Z390 PRO - C114 at Amazon.com
GIGABYTE Adds Support for 128 GB of Memory to Z390 & C246 Motherboards
ASUS Offers BIOS Update: Z390 now supports up-to 128 GB RAM