I have a Ryzen 5 1600 Build. With Corsair Vengence Pro RGB, DDR4, 3200 Mghz. On a Asrock X370, and Windows 10 Pro.
I have my RAM Clocked in at 3200 on my bios, but Windows only see's/uses 1600.
My friend has a similar build but with a Ry5 2600, Same Ram but his is 3000 all on a Asus Prime X470 with Windows 10 Home.
He is having the same exact issue.
So If you updated to 1903 Please Check your speeds! Wonder if its a Ryzen only problem.
Check Comments for Pics of my prof.