If you have a backlog of 50+ classic PC games, an aging GTX 1070 or RTX 2060, and you want to feel like you just installed a $700 graphics card upgrade for free, then Reshade Ray Tracing shader RTGI 0.33 is still the king.
Motion vectors allow the shader to track object movement relative to the camera, significantly reducing the "ghosting" or "trailing" artifacts common in earlier versions. Improved Temporal Accumulation: Reshade Ray Tracing shader RTGI 0.33