Yeah, SyncScanLine0=200 means the tear line should be visible at the bottom (200th horizontal line from the bottom up) if I understand correctly. As negative values go below the bottom of the screen (=hide tearline). GPU usage affects scanline position accuracy though. With high or very varying usage the scanline might be "oscillating" a lot and if you try to look at just one spot perhaps you miss it. Framerates below your refresh rate will naturally cause a visible tear line as Vsync is off and framerate doesn't match refresh rate anymore. PS: entire point of S-sync is to have Vsync smoothness without actually using Vsync while hiding the tear line. So if you can't see it, be happy Also there are no universal settings that should work. GPU headroom, monitor type and resolution, game you're playing all matter. Chances are you need to use different scanline target value for all your games for best results.