Well any application written in Xcode should support dual processors pretty much by default. Bryce does not because it's written in its own quirky language and has been around since before dual processor systems. But, you will still see a speed boost because you basically have a dedicated processor running bryce 100%. If you only had a single processor, not only is it trying to render in bryce, but it's sending data to the grapics card, and to the hard drive, and swapping data into RAM, and calculating lots of stuff for every open application, and especially in a consumer model like a celeron, it's not built to do that. A dual processor isn't just like having two processors, it's a bit smarter than that. It uses one for the menial tasks like loading your web pages and typing in word, and the other can be set free rendering at 100% without slowing anything else down. So feel free to rip cds, catch up on the forums, and import your photos while rendering, because nothing will slow down :) Oh by the way, you suck for having a faster G5 than me. :-P