The effect flickers or looks like "soup." Solution: Screen-space ray tracing requires a depth buffer. Go to the ReShade "Add-ons" tab and ensure "Copy depth buffer before clear" is checked. Also, disable anti-aliasing in-game (use ReShade's SMAA instead).
After installation:
Here’s the complete relevant content and where to find it: reshade ray tracing shader rtgi 033 free
Ray Traced Global Illumination via Reshade Post-Processing Version Focus: Pascal Gilcher’s RTGI v0.33 Platform: Reshade (DirectX 9, 10, 11, 12) The effect flickers or looks like "soup