hmm that's interesting, maybe that's their way to support users and push nvidia to provide g-sync drivers without gpu id restrictions...
Or it is simply some newest driver's issue.
check your hardware identification on graphic card properties, should be one of these (for 970m and 980m)
Do you have Optimus tech on this unit?
What is your screen panel?
What does Asus support have to say about this?
I wouldn't let the return to vendor time elapse, if tech support can't come up with an answer I would return it for replacement or refund also you might PM cl-albert he may have information on this issue he is our C customer L loyalty rep and is an Asus Employee. Again I wouldn't let the return to vendor time elapse.