Have B5 and Panther 10.3.6. Although my processor would constantly run while B5 was open on my Titanium G4 with 800mhz, on my new computer, a G5 dual with 2.5 ghz processor speed, it's much better. I've only had the new computer for about a week so haven't yet had a chance to fully stretch its legs and test things out. I did notice that launching B5 cycled up my processor but once started, all quieted down. It will be interesting to see how the G5 handles volumetrics, etc. All I can say for sure is that the increase in processor speed has blown my mind. :)

I dare you, while there is still time, to have a magnificent obsession. --William Danforth