So with the performance impact screenshots floating around and my own testing I have cranked up a bunch of my settings from high to ultra and have it running 4k60 (80% render) pretty much locked. even in St Denis with tons of fog et al. Looks way better than my previous settings.
2700x @ 4.2
2080ti on water @ 2100mhz
16GB 3200cl14
NVIDIA GeForce RTX 2080 Ti, DX12
3840 x 2160, 60hz, Windowed: No, Vsync: Yes, Triple: On
Textures: Ultra
Anisotropic: 16x
Lighting: Ultra
Global Illumination: Ultra
Shadows: High
Far Shadows: Ultra
SSAO: High
Reflection: High
Mirror: Ultra
Water: Custom
Volumetrics: Custom
Particles: Ultra
Tessellation: Ultra
FXAA: Off, TAA: Medium, MSAA: 0
Near Volumetrics Quality: Ultra
Far Volumetric Quality: Ultra
Volumetric Lighting Quality: Ultra
Unlocked Volumetric Raymarch Resolution: Off
Particle Lighting Quality: High
Soft Shadows: High
Grass Shadows: Medium
Long Shadows: On
Full resolution SSAO: Off
Water Refraction Quality: Medium
Water Reflection Quality: Medium
Water Physics Quality: 50%
Resolution scale: Mode4o5
TAA Sharpen Intensity: 100%
Motion Blur: On
Reflection MSAA: Off
Geometry Level of Detail: 100%
Grass Level of Detail: 83%
Tree Quality: High
Parallax Occlusion Mapping Quality: High
Decal Quality: High
Fur Quality: High
Generated with Forceflow's RDR2 settings parser
2700x @ 4.2
2080ti on water @ 2100mhz
16GB 3200cl14