[garnoil]

Is it possible that your resolution is just too low to play back smoothly? 720 X480 is really very low. Many years ago I was running a canopus box at the 720X40 resolution and although it was not "jerky" per say, is certainly was not good quality. It was difficult to spot sound effects like footsteps, punches, etc. I run video at 1980 X 1020 Pro-res (I have an intensity card) and all my monitors are at that resolution or higher. Video play back is very smooth and solid. My sessions are feature films and the video alone is usually about 90 gigs. Video runs from a dedicated firewire 800, and audio is also split among several firewire 800 drives. The system, now under 8.03, appears to be very stable and responsive. You may want to try upping the video resolution and try the Prores codec. Hope this helps.

G