Both , and using Acer Nitro VG272 Xbmiipx 27" Full HD (1920 x 1080) IPS AMD Radeon FreeSync and G-SYNC Compatible Gaming Monitor, 240Hz, Up to 0.1ms Response Time, (1 x Display Port & 2 x HDMI 2.0 Ports)Is this in windows or in games?
What monitor are you using?
For games: Vsync On/Off in game is used to stop screen tearing in return for a capped frame rate.