Hi Cowboys,
Dunno what happen but my game run very correctly with "almost" perfect cards scaling with pair of GTX 1080 ti’s and i see a real difference ingame.
Its maybe the best result till the beginning of the game with multi gpu and i was able to push a bit further my graphicals settings with gain power.
I will try to give some leads...its not definitive solution its just leads because i read some have problems with crashing and so on (so maybe it could help)
and i didn't get any problems last days.
Windows 10 – 64 pro 1909 version 10.0.18363
NV drivers 445.87 using Direct Driver Uninstall
No added argument in R* launcher
i vsync the game at my max framerate 60fps on a 2160p monitor.
have a bit OC to both cards to push a bit to 2012 to 2025 Mhz & VRAM +400 Mhz.
Every time and after all update, i try to check the game library with embedded tools in rockstar game launcher.
Then i delete « pipe » files into C:\Users\ « PCname »\Documents\Rockstar Games\Red Dead Redemption 2\Settings
You will find 6 files starting by « sga » (4 for Vulkan API and 2 for Win32) delete all those 6 files.
Then launch the game and first go in parameters (first) and select DX12 API, then go in story mode (wait a bit) (check if there is some crash or strange behaviour) then close the game.
Start the game again and go in parameters (first) and select Vulkan API and launch story mode
(this is just to reconstruct deleted sga files bellow) and start to apply graphicals settings to your taste.
Restart system entirely
(i look for constant solid 60 fps with far possible settings) what is see is that the cards are in green area around 85% usage with max clock but upper like more than 91% usage it start to downclock and in some areas its possible to get a fps drops and i don't want that. so keep it under 91% loading usage at max of the case.
Share my graphicals settings if its help (can't push much than this without fps drop)
Resolution: 3840x2160
Fullscreen
Vsync: On
Triple Buffering: Off
========================
Texture quality: Ultra
AF: 16x
Lighting: High
Global illumination: High
Shadows: High
Far shadows: High
AO : High
Reflection: High
Mirror: High
Water: Custom
Volumetrics: Custom
Particle: High
Tessellation: High
TAA: Off
FXAA: On
MSAA: Off
========================
API: Vulkan
Near volumetric: Low
Far volumetric: Medium
Volumetric lighting: High
Unlocked VRR: No
Particle lighting: High
Soft shadows: High
Grass shadows: High
Long shadows: Yes
Full res SSAO: Off
Water refraction: High
Water reflection: High
Water physics: [2/4]
Resolution scale: Off
TAA Sharpening: [0%]
Motion blur: Off
Reflection MSAA: Off
Geometry LOD: [3/5]
Grass LOD: [6/10] or [5/10]
Tree quality: High
Parallax occlusion mapping: High
Decal: high
Fur: High
Trees Tesslation : Off
Adding a bit adaptative sharpen on top of that by nvidia 3D settings parameters into drivers.
Multi gpu scale very well to 75% in empty area between Valentine & Emerald Ranch and up to 97 to 98% in hard area like cripps camp by night or under prohibited bar with musicians 😉
Fps is very stable to 60 fps in 98% of the case and 58 fps drops sometimes (due to loading i don't have it instal on my SSD) but in a second return stabilize to 60 fps.
i test to try to enable Async mode under user.cfg settings but it crash my game twice so i went back on that point.
Tested over 40 hours online playin you will experience small clipping over volumetric fog and some textures like the « blood over the Rhodes butcher apron ». Very strange i test a lot but was unable to avoid it
But if you find a way i'll take it ;)
For me its definitively the best result i ever got with multi gpu on RDR2.
This morning i get a « gfx error » on start, i reboot pc and all ok by now.
Hopes its help.
Cheers