Hello Robert !
Nice specs you have. My rig is a Core i7 9700KF @ 5Ghz and 32Gb 3200 ram, I am getting Cas 16 DDR 3600 in case it helps with stutters - I run a 1440P monitor and get 45-60 fps flying normally but occasional dips to 16 fps at certain high res airports when close to say a very detailed terminal building. I have a GTX 1080 Ti. Could be having driver issues of sorts but all in all it works well. - SO: I do hope you get DDR4 3200 at least or even better DDR4 3600 (get CAS 16 not CAS 18 in that case)