I have moaned about kontakts poor polyphony on my mac 667 for a while now.
The mac gets only 24 voices before SPLAT!
My PIII 800 gets over 40.
But my new P4 2.4ghz......drum roll.........
90 stereo voices!!!
Easily without issues. And this is without streaming anything.
Not bad at all.
Oh, and this is using a 128 sample buffer!!!!
If feels almost as tight as giga!
I am building another PC just for Kontakt!!!
Please feel free to suggest any more detailed tests. I would be happy to pound on this system for you.