I’ve got GeForce GTX 1080 using 396.54 and a brand-new Dell S2417DG, and I’m not seeing any G-SYNC options under the OpenGL tab in nvidia-settings. What’s going wrong?
I used HDMI instead of DisplayPort and that was the issue (see https://www.dell.com/support/article/us/en/19/sln302596/how-to-use-and-troubleshoot-the-dell-s2417dg-gaming-monitor?lang=en)