This card uses the Theatre 200 chipset from ATI, so it will perform the same as pretty much any other ATI card that has existed since 2001.
Your computer seems to be fine, hardware-wise. We'll have to keep an eye on that AMD CPU for conflicts, but it's unlikely these days. If the Creative card is a SoundBlaster AUDIGY card, we'll keep an eye on it too, but at the moment you're not having any sort of audio sync troubles. That list you have there looks neat, I assume this came from some sort of utility and then you merely copied/pasted the data here?
While I am aware of some issues dealing with the newest ATI MMC, we'll hold off on downgrading that, for the moment.
Jerky or choppy video tends to be the result of dropped frames, from framerate conversion issues, or from deinterlacing/telecining processes. So we'll have to tackle these issues one by one.
Have you read the capture guides here? How does it perform with an MPEG-2 capture? How do it perform on an uncompressed AVI capture?
http://www.digitalfaq.com/dvdguides/...eg/atimpeg.htm
http://www.digitalfaq.com/dvdguides/...avi/atiavi.htm
Have you adjusted ATI MMC to display dropped frames count (shown in the guides)? And if so, are there any frames being dropped? And then have you referred to the dropped frames guide?
http://www.digitalfaq.com/dvdguides/...ppedframes.htm
The interlace/IVTC issues are options that are discussed in detail on the capturing guides.
Let me know where you are, and what you're seeing.