Ok, let me give you more detail:
My GPU is Radeon HD5670. I use madvr (with smooth motion turned on) and the stats are ok, the card can keep up with the sttings i use. No frame drops (except when starting a video). My problem is not somethink like skipping or leg because of high cpu and gpu usage. I have 50 fps and 60 fps judder test videos and they are perfectly normal (those sliding strips in different speeds). But when i try test files with 23.976, 24 or 2.97 fps sliding strips move with horrible judder or flickre or how you call it. I can observe this in real movies when camera pans or a close object moves while the camera is steady. I wonder if this is normal for movies because they are shot in low frame rate. And i want to know if there is something i can do to reduce it. For instance what refresh rate should i set on desktop? My projector supports 720p @50, 60 and 120 hz.
Thanks!