I was able to get this to work today!
I am running (2) 1080 ti cards
1.Go into the nvidia control panel.
2.Under “global settings”
3.Look for “SLI Rendering Mode”
4.Change option to “Force alternate frame rendering 1”
I am running a i7-8700k w DDR4-3000 (32GB). Two cards work MUCH better than 1 card alone FOR SURE. all of my settings were maxed out except anti-aliasing, i had that on the second notch from the left side.
You may need to change setting back for other games.