AOC monitor

Hello guys , i just bought myself a new monitor ( AOC G2460PF 144hz freesync ) and the problem is that its not going to 144hz , the most i can get is 120hz . Is it because i have a bad GPU ( Nvidia 1030 2gb ) ? Or is something that im doing wrong ? I tried with different cables such as DVI or...

my specs are Gigabyte GA 78LMT USB3 mobo Coolermaster 500w PSU 6gb ram AMD FX4300 cpu i installed new GPU yesterday [ GTX 750 TI 2GB OC] . every game was working like a charm even at high-ultra settings. i was playing battlefield 3 at high setting and my PC got tripped and it restarts without...