Yes, but the ordered dithering algorithm in madVR is more advanced than what e.g. LAV does, or probably also what MPDN does. What is more, madVR's ordered dithering also by default (unless you enable that "trade quality" option) runs in linear light instead of gamma light. And if you enable smooth motion FRC, it has to dither many more frames than otherwise. So unless you level the playing field, it would not be fair to compare the rendering performance of madVR and MPDN. So you should at least enable that "trade quality" option and disable smooth motion FRC. And even then madVR still probably does more work because madVR's ordered dithering mask is probably bigger than MPDN's. I can't say the latter for sure, though, because I don't know what MPDN does exactly.
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