nightsurge said:
Screen tearing is a phenomenon in video where a newly rendered frame overlaps a previously rendered frame, creating a torn look as two parts of an object (such as a wall) don't line up. This occurs when the output device sends frames out of sync with the display's refresh rate. Screen tearing usually only happens when the framerate of the game is above the refresh rate of the device. Ghosting, however, can happen on anything because it completely relies on the refresh rate of your device and not on the actual FPS the game can run at. A monitor or TV with a 60z refresh rate can only produce 60 fps without tearing. Any higher and it tears. Screen tearing does not usually happen when the framerate is below the refresh rate (which most consoles have frame rates well below 60fps). He did a horrible job describing the symptoms occuring, and he probably knows of V-Sync because he plays computer games as well. Even if a console game has V-Sync, screen tearing will be stopped but it can still show ghosting due to a slow refresh rate on your display (8ms especially).
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Tearing can happen at much lower framerate if the v-sync signal is not honoured because it only means that the framerate does not align neatly with the vertical blanks. That's why, i suppose, games tend to run at 60 or 30 fps: it makes this alignment easier. It will happen for sure above 60fps (if that's your display's refresh rate) in the same conditions.
Ghosting does not look like tearing at all, that's why I found his symptoms description totally unambiguous. Actually ghosting will smooth out the tearing in some measure, a bit like a merge algorithm does for deinterlacing.
Please read this and this for examples of games running at 30fps, but with a percentage of torn frames between 10% and 50%.
