[posixx]

I also have the artifacts visible, and can confirm that with overscan correction set back to 0,0 via the GUI,  the artifacts are no longer visible .
 hardware: asrock J3355m 

 Yes when resetting to 0,0 on the overscan page you cannot see the artifacts anymore. But ofcourse this way the menu's are falling behind the border of the screen..

Sounds like your TV has overscan set. You need to change to have 1:1 scanning in the TV menu. On LG it’s called ‘Just Scan’ on Sony it’s ‘Full Scan’ I think. Overscan enlarges the the screen by about 5% which was a leftover from analogue TV. With DTV and Video over HDMI you don’t want any scaling at all (artefacts and loss of edge video)

I don’t have such setting. Also using NUC or Xbox one X the picture fits perfectly.