Mac Pro with NVIDIA 8800 GT HD Playback

I just upgraded from my 2.7 GHz Dual G5 to a brand new Mac Pro Dual Quad 2.8 GHz Xeon (Early 2008) with the NVidia 8800 GT GPU. I'm having issues with HD (1080P) video playback in which the video stutters (would appear that the frame rate drops for a fraction of a second and then returns to normal). This is an intermittent problem and so I can rewind the video and watch the same scene again and it looks fine.
Is anyone else having this problem? Does anyone know of work-arounds? Are there any utilities to configure the NVidia 8800 GT video card like what ATI had for the X800 XT?
Thanks for any help!
Greg

I would add more memory, even if it doesn't seem like it is problem, OS X and apps will try to use what is available and use free/inactive memory as cache.
http://www.barefeats.com/harper3.html
Glad you kept one drive 'as is' - if someone does want to test out or migrate always better to work off a cloned system until you know it works.
I try to have all the media on a stripped RAID, a dedicated boot drive with nothing else on it, which keeps things running smoothly.
http://www.barefeats.com/harper9.html
OpenGL graphics:
http://www.barefeats.com/imp04.html
http://www.barefeats.com/harper10.html
http://www.barefeats.com/harper16.html
8800 vs 2600: http://www.barefeats.com/harper8.html

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