Are you using the same monitor? There was a weird issue with certain 4k screens.
Sorry for this issue. Did you ever find a solution? Please let us know if you have or if you still need help.
Did you ever find a solution?
I'm also built an editing machine with Ryzen 1700x. And it's awesome with cinema 4d, but my main tool is adobe after effects, and it works not as fast as it possible. Don't know what to do, I've spent a lot of money for new machine for after effects, but it works almost the same as my 3 years old i5 laptop