Well looks like I was wrong. I actually got it working guys. 
 
Settings used:




 
Single 2080 Ti:

 
SLI Enabled:

 

 
My sli profile...
 
Profile "Red Dead Redemption II"
ShowOn GeForce
ProfileType Application
Executable "red2.exe"
Executable "rdr2.exe"
Setting ID_0x00035aed = 0x00000001
Setting ID_0x00a06946 = 0x080000f5 UserSpecified=true
Setting ID_0x00fc7620 = 0x00000000
Setting ID_0x1033cec2 = 0x00000002 UserSpecified=true
Setting ID_0x1033dcd3 = 0x00000004 UserSpecified=true
Setting ID_0x105e2a1d = 0x00000004
Setting ID_0x106d5cff = 0x00000000
Setting ID_0x10f9dc81 = 0x00000011
Setting ID_0x80857a28 = 0x00000001
EndProfile
 

wow you are the man Sajin. Is this in Nvinspector or what ?

mhijazi
wow you are the man Sajin. Is this in Nvinspector or what ?

Yes.

i cant seem to find those values in sli inspector, could you perhaps upload your profile for others to use?

Sajin
My sli profile...

Profile "Red Dead Redemption II"
ShowOn GeForce
ProfileType Application
Executable "red2.exe"
Executable "rdr2.exe"
Setting ID_0x00035aed = 0x00000001
Setting ID_0x00a06946 = 0x080000f5 UserSpecified=true
Setting ID_0x00fc7620 = 0x00000000
Setting ID_0x1033cec2 = 0x00000002 UserSpecified=true
Setting ID_0x1033dcd3 = 0x00000004 UserSpecified=true
Setting ID_0x105e2a1d = 0x00000004
Setting ID_0x106d5cff = 0x00000000
Setting ID_0x10f9dc81 = 0x00000011
Setting ID_0x80857a28 = 0x00000001
EndProfile

Should this work for 1080ti cards as well? Also, are you using the new NVidia drivers, or are you rolled back to a previous version? I've read others had to rollback to get SLI working, but I don't think they had to use a NV profile to do it.

Sajin
Well looks like I was wrong. I actually got it working guys. 
 
Settings used:




 
Single 2080 Ti:

 
SLI Enabled:

 

 
My sli profile...

Profile "Red Dead Redemption II"
ShowOn GeForce
ProfileType Application
Executable "red2.exe"
Executable "rdr2.exe"
Setting ID_0x00035aed = 0x00000001
Setting ID_0x00a06946 = 0x080000f5 UserSpecified=true
Setting ID_0x00fc7620 = 0x00000000
Setting ID_0x1033cec2 = 0x00000002 UserSpecified=true
Setting ID_0x1033dcd3 = 0x00000004 UserSpecified=true
Setting ID_0x105e2a1d = 0x00000004
Setting ID_0x106d5cff = 0x00000000
Setting ID_0x10f9dc81 = 0x00000011
Setting ID_0x80857a28 = 0x00000001
EndProfile

I’ll test this tonight. If it works, you are a genius.

Does it work with TAA? Do you get any stuttering?
I have 2 2080 Tis. What cards have you got?

Hello everyone and thank you Sajin!

However, does anyone knows how to add the "User Specified" values? I'm not finding those in my Nvidia Inspector so I guess I have to add them manually, right?

I’ll test this out tonight...hopefully it will work with 1080 SLI. I doubt it will work with TAA, it never plays nice with SLI.

Thank you in advance sajin!

Let’s hope an official SLI profile gets released soon in the meantime.

 

dataplague
i cant seem to find those values in sli inspector, could you perhaps upload your profile for others to use?

PeterBee911
Hello everyone and thank you Sajin!

However, does anyone knows how to add the "User Specified" values? I'm not finding those in my Nvidia Inspector so I guess I have to add them manually, right?

In NVIDIA Profile Inspector, "Export all driver profiles". Open file in a text editor, find the profile, and replace it with the one Sajin gave. Save it, and "Import (replace) all driver profiles" using that modified file.

How exactly does one create/import such a profile? The .nip files the Profile Inspector uses are formatted differently, and entering the IDs and settings into that format manually didn't work, so how do I import this?
I have found a different solution to get Sli working, but yours seems superior, so I'd love to know how it's done.
 
EDIT: Well, nevermind, I wrote this a minute too late.