Your CPU is close to the age of mine. I have an Intel 9900KF. A Radeon 6900XT or 6950XT would be very compatible and a large jump without bottlenecking.
AI artifacts are going to usually come from frame generation, while blurring and ghosting tend to come from TAA. AMD doesn't have any AI-speciqfic Chipsets built into their cards, as far as I know.