NVIDIA has officially adopted Adaptive-sync.
They've tested 400 displays so far, of which 12 got official "G-sync compatible" stamp aka works automatically, on the rest user can manually enable support and see how it goes. NVIDIA claims they're going to test every single Adaptive-sync (FreeSync) display out there to grant more stamps if applicable.
https://blogs.nvidia.com/blog/2019/01/06/g-sync-displays-ces/
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Long story short, you need to have AMD APU as primary graphics, enable FreeSync on it and run the cable from display to your mobo instead of the discrete GeForce. Once you set GeForce to be the preferred GPU from NVIDIA control panel (Win10 1803 GPU selector should also work), GeForce handles the rendering but uses AMD APU as the display controller (like Optimus in laptops), which then syncs the display refresh rate to FPS to enable FreeSync
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