sony vegas 9 pro. What determins the speed of playback in the preview window?

What we are trying to determine is what part of the computer is most important in determining the speed of video playback in the preview window.  Is it RAM, Graphics Card, Processor, Hard drive speed?  Any input on this would be great.
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Aaron FeledyConnect With a Mentor Drupal Developer and ConsultantCommented:
It's a combination of all those things, but RAM and Processor have the biggest impact.
Aaron FeledyDrupal Developer and ConsultantCommented:
It's the processor mostly because the RAM will only make for slow playback if you currently don't have enough.
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