A few days ago I bought my new S2417DG Nvidia G-Sync monitor and it has been working fine but I cannot overclock it with the AMD FreeSync R9 390. I've tried plenty of stuff and I do have my monitor and graphics card latest drivers. Every time I try to overclock the monitor on the On Screen Display (OSD) the monitor, after enabling the overclock and choosing the 165Hz option, asks me if i would like to reboot so that the overclock could be applied. I select "yes", then the monitor restarts but nothing changes. It is still on 144Hz after the reboot and there is no option on the windows settings to let me go further than just 144Hz. I would really appreciate some help on this issue, thanks in advance.

Other stuff that may be important to know is that I'm using windows 10 and I have an AMD graphics card at the moment (R9 390), so I'm not using the G-Sync feature for now.