I've had my 6900xt since November/2021 and Ive been dealing with the stutter ever since. Not just Caldera which has stuttering so bad its unplayable but even with high frames in multiplayer or rebith etc, 1% lows are awful.
My system is a 6900xt/5950x/asus x570 dark hero/ 32gb 3800 c14 ram. 1000w evga psu. I play at 270hz 1440p lowest graphics possible.
Ive switched gpu, cpu, ram, went to an asrock x570 taich8, and upgraded my psu from a corsair rm850 to the evga 1000. Stutters disappear with nvidia gpu.
Ive done every tweak that was possible in radeon software/windows/bios and in the game and nothing completely fixes it.
Downclocking the gpu helps some, but one thing that helps (doesnt fix completely) i had was disabling ftpm in bios for windows 10. Not sure why but eventually they came out with an agesa 1.2.0.7 bios for some motherboards.
Even when i have over 300 frames in multiplayer, my 1% lows will be in the 150-200 fps range. The game doesnt feel smooth at all.
Hoping for an eventual fix, since this issue has been pretty well known complaint for awhile.