If you have a notebook that is supposed to come with G-Sync please try the following:
1. Power on the unit and keep pressing ESC
2. Select Enter Setup
3. Press F9 and select Yes (Load Optimized Defaults)
4. Press F10 and select Yes (Save and Exit)
5. Go into OS and verify (Right-click desktop and choose Nvidia Control Panel). If g-sync still does not show
6. Restart computer and re-verify.