Its almost definatly V-Sync, which stops tearing in games, any higher frame rate would be pointless anyway as the panel cannot display it as its only recieving a horizontal scan at 60hz. So V-Sync (Vertical Synchronisation) will sync the horizontal scanning the same as the vertical so that the picture cannot be distorted due to differences in refresh rates. Keep it as it is as it will prevent tearing and you could encounter other problems.