On 9.1 you can use the Newer Control Panel and Extension; but I got some problem at a cold startup (I have a 9600 with NewerG4 and a lot of PCI cards). Two days ago, I downloaded the Xlr8 control panel and... it works fine! No more crashes and the cpu specs are the same.
On OS X try the enabler from Newer, Xlr8 or the upcoming Sonnet drivers for Newer cards (both ZIF and PCI, you must pay for).
Bye
Sam