Please, avoid "adaptive v-sync" name since that's for an openGL extension (aka late vsync) that just conditionally toggle standard normal plain old-fashioned v-sync
- Hacked drivers aside, a freesync or gsync rated monitor.
Because hardware should be already in place in:
- whatever is gonna use HDMI 2.1 (amd did come earlier maybe though? Hell knows if already with 1.2, or 1.4)
- some lucky desktop monitors with DP 1.2a may optionally support it (be very careful when using VESA's "Adaptive-Sync" name)
- but especially on just any laptop/AiO with an eDP internal connector (though best if in version 1.3)
but, you know "they have to ensure optimization", and certifications to be awarded. And Intel has yet to be seen.
- A supported gpu, connected directly to panel (thus don't expect anything from optimus/enduro cards)
(at least Display Controller Engine 8, ie GCN 2nd-gen | "any GeForce GTX 650 Ti BOOST or higher" wtf that technically entails)
- Mad yourself up with software
Exclusive fullscreen windows should be quite on the safely-working side everywhere. But borderless fullscreen starts to get messy then.
And only nvidia for the moment supports bordered windowed, with many caveats.