I noticed that in Tekken 7 (Unreal Engine 4 title) my GPU's memory doesn't boost to it's highest state when running fullscreen mode. Graphics are set to 1080p everything Ultra. I tried disabling/lowering the game's AA settings and still we get drops.
Vega 64 (Water Cooled, temps stay low)
Latest Windows 10 version
Latest Adrenaline driver (19.3.3) AND Latest Adrenaline driver (19.4.1)