GTX 770 4gb Unable to select 144hz on dell S2716DG.

We know that the S2716DG is built to do up to 144Hz. So the fault must lie with the video card driver or the video card itself. I would start by reading through this.

Thanks for reply, so monitor is working properly and its video card problem yes ?

I tried almost everything, I'm out of ideas. I think I will just wait for better GPU, but I need to be sure that

monitor is working fine becouse I don't want to refund it...

Thanks for answer, but no I'm not using this freature I even disabled g-sync but its still don't work. 

All options to change Hz on all ressolution;

-120

-100

-85

-60

-24

Are you running in ULMB (Ultra low motion blur) mode? 

This only runs up to 120Hz

Have you installed the latest Nvidia driver from the Nvidia website?

Yes.

I doubt that the monitor is defective on a hardware level. But per the warranty, you may initiate a monitor exchange. Test the replacement before sending any monitor back to Dell. If the replacement does not have the issue, keep it and send us the original. If the replacement has the SAME issue, the monitors were not at fault. Send the replacement back to Dell. Look to the video card as the culprit.

I have the same problem with my S2716DG.

Asus GTX770-DC2
GeForce 361.75
Windows 10

But can anyone explain me, why the OSD is always displaying 2560x1440 as current resolution, even when i change it to a non native one like 1920x1080 or 800x600?? see http://i.imgur.com/Mq9Ioyx.jpg?1

Thanks for information !

So now I need to wait for next nvidia generation, I hope we will see it in 2/3q of this year.