You might want to try this.
I have upgraded my GPU from a GTX 1080 into an RX 6800 XT recently and I get high FPS, but poor motion performance (micro-stuttering).
I realized when I monitor the frame time with afterburner that it is going extremely high. I noticed the stuttering happens specifically when the core clock goes below 1GHz.
I raised the min core clock to 1.3GHz in Radeon software and the micro stuttering is virtually gone.
It looks like AMD's power-saving algorithm is aggressively down clocking the core clock as much as possible as often as possible to save power. It will display high FPS on the meter, but what actually is happening is the FPS is dropping rapidly which doesn't show on the FPS number, but you can confirm it by checking the frame time. The frame time should not exceed 1000 / monitor refresh rate = x (example 1000 / 144Hz = 6.94ms). 6.94ms assuming your PC can actually do 144FPS.
