I own a MSI B350M Bazooka motherboard and this RAM is made with real 16 Gb chips and 16 chips, 8 on each side. A measly $245 a stick right now but price rot will bring it down to where I like it. JEDEC has 16 Gb in the spec so this is now the top deck for DDR4 unless JEDEC amends the standard.
M378A4G43MB1-CTD may be a part number but nothing on NewEgg or Amazon yet
Amazon has the server version but Samsung has unbuffered in their catalog.
So I wonder if MSI and AMD are going to let me install these on my B350 based motherboard and have the insane 128GB of RAM on an AM4 rig