Just curious if you ever figured this out. I am experiencing the same issues:
i9 10900k
RTX3090
64gb Ram
Video feeding from SSD
Drivers are up to date.
GSync on monitor is off
Using Display Port 1.4
It was actually working fine since I installed and then yesterday began with the choppiness. Not sure if you found anything that might help.
Thanks
I finally had a day to do a clean install. First thing I did was install creative cloud. Loaded up some media, plays fine. Ok, resolved, yay. But I wanted to see what happened. So I installed each app one by one to see if there was any conflicts or if it was just a weird bug when I switched my GPU. When I installed Dropbox, premiere started dropping frames and doing the micro stutter thing. I also notice that in windows in general, you can notice micro stutters in the mouse. Bummer cause I use Dropbox in my workflow on occasion. I uninstalled it and performance improved (but didn't go back to no dropped frames again). Two days after having Dropbox uninstalled, started working again with no dropped frames, no stutter. I'm not saying that'll be the solution for all, but that's what worked for me. Thanks everyone for all the help trying to solve this.