Video playback stutter

Hey everyone, having playback issues when using iTunes or Front Row, stuttering video playback.  This happens with purchased content in iTunes or ripped content in either software.  Using handbrake for backups of my DVDs and this is driving me nuts.  There are a few occasions when this will not happen.  But nothing consistent that I can track it.  Dual video cards, 1 to my 22" monitor and the other hdmi out to my 46" Sony Bravia.  Any thoughts would be great.
Thanks!!

nah, i figured out the problem. It was the video, it wasnt playing well at all. I just re-downloaded it and it worked fine

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