This guide will tech you how to enable SLI in Far Cry New Dawn.
Firstly, you need Nvidia Inspector tool to change values.
SLI profile “code” here —> 0x2A0115F5 (Debug Mode AFR-FriendlyD3D + Possible Hints, Agents of Mayhem, Rising Storm 2: Vietnam, World Of Warcraft, Far Cry 5)
Just follow the guide in the picture below