What factors affect encoding speed the most?

Hello everyone,
I am actually quite happy with the encoding speed to DVD formats. I was under the impression that encoding was "real-time". Encoding a 1 hour long PAL 48kHz capture from VHS to DVD only took ~30m.
I opened the task manager and noticed that both cores of my Athlon X2 5400 were running flat out during this process. Thus I take it encoding can utilise multiple cores.
My questions are:
If I upgrade to a Quad core CPU what performance increase would I see with the encoding example above? 15m?
What influence does hyperthreading have -if any?
Do you expect that PE8 will support nVidia CUDA at some stage? I notice that the latest Roxio software does.
Will the encoding slow down dramatically when I start working with HD content?
Do any of the Matrox hardware encoders work with PE8? They only seem to support Premiere CS4
I have SATA-II RAID 0, 2GB RAM, AMD Athlon X2 5400+ and XP SP3
Justin.

Export and Rendering speed can also be affected by one's I/O sub-system, i.e. your HDD's (Hard Disk Drives), their speed, amount of free space, the controller type and how you have these HDD's allocated.
With the exception of AVCHD, which Steve mentions, having separate physical HDD's (not partitions - logical drives), will speed things up greatly, as all operations on the computer, access to the OS, the program, the media files and then outputting from the program, will be spread over several HDD's. If you only have one physical HDD, everything has to flow through one "pipeline," and this adds significant time to the processes. Having partitions will slow things down even more, and can even cause hangs, because the OS "thinks" that it has multiple HDD's to use, but only has one. It cannot understand what's taking so long, and grows impatient.
With AVCHD, the CPU is used much more than even the I/O sub-system, and becomes the most important link in the chain.
Good luck, and let us know all about your HDD's, their number, size, speed, controller type, say SATA II, and how you have these allocated.
Hunt

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[URL="http://freedomvideography.com"]Wisconsin Wedding Videography[/URL]

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