Quad Processor Not Using All Four Procs?

Hi All,
I am using a Quad-G5 2.5Ghz with 4.5 GB of DDR2 SDRAM, 10.4.8.
When I do an encoding with Compressor and open up Activity Monitor, the process hovers around 240%. The next highest processes use between 1-5%, and way down below it says about 38-42% of the CPU is idle.
I have similar results doing any processor-intensive function. I understand not ALL programs can take advantage of the processors, but I am 99.99% sure the Apple Final Cut ones can.
Any suggestions to use all the processor power? Doing a PAL->NTSC conversion takes long enough; it's really bad only using 55% of the total CPU power....
Thanks,
Jason
G5 Quad 2.5Ghz, 30inch Cinema HD Display Mac OS X (10.4.8)

A lot of it depends on the input and output codecs as well. Some are more heavily optimized than others. It also depends on the version of Final Cut Studio you have. The UB version takes better advantage of multiple CPUs than the non-UB version does. So, if you're using Compressor 2.1 or greater, you'll see better performance than if you're using Compressor 2.0.1 or earlier.
For example, encoding a DV movie to MPEG-2 on my Quad will use up to 370% or so with Compressor 2.3. Encoding a movie that uses the Animation codec to MPEG-2 with Compressor 2.3 takes much longer. Granted, the data rate of the Animation codec is much greater than that of the DV codec, but the CPUs are not nearly as well utilized.

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