Hi, are you sure that Vertical sync in nv control panel/manage 3D settings is set to gsync? and not just enabled in the display/enable G-Sync, also in the game settings make sure v-sync is set to OFF
4930k/Corsair H110i GT: Rampage IV Black ED motherboard: Gskill 4x4GB 2133MHZ 10 11 11 30 1T: CM V1200w Platinum psu: 2x EVGA GTX980Ti SC ACX++: SoundBlaster Zx: Logitech Z906 5.1-channel speaker system: Samsung 850 EVO 500GB SSD: 1tb WD Black HD/512GB WD Black HD: Asus Swift 144HZ 3D 2560x1440 Display: QNIX QX2710 Evolution II 2560x1440 matte PLS display: Corsair Vengence K70 mechanical keyboard: Corsair M45 mouse: Thermaltake Core V71 full tower Case: Windows 10 64bit