Without driver, putting an Apple G4 in a G3 - even B&W - requires proper software.
I have a G3/350/1MB from b&w and am using 500/250/1MB from Powerlogix and even it needs software to use. (I'll sell the 350 is available for $75).
Prices usually drop over time and bugs. I think you can buy XLR8's software pak but don't know if it that works with anything other than their own cards.
Greg