Nukeboy, I've done some testing and had some communications with DAZ tech support.  Bryce on high priority render can only see 8 actual cores.  If it sees virtual cores, then only to 20 percent at the most.  It won't see a second CPU.  On medium priority it sees half the actual cores you have up to 8.  On low priority, one core.

So for a bryce machine, 8 actual high speed cores will be the best it can handle.  Some AMD cpu's do that.

For everything else (other than Terragen Classic), just about as many cores including virtual cores that you can throw at it will likely work.

I built a dual cpu 6 core intel.  Bryce on high priority uses 6 actual cores up to about 80 percent and two virtual to about 10 percent.  That's it.  Poser and Vue and TG2, etc, use all 24 cores.

Used Argus monitor and win7 resomon and gpu shark to test.