As far as I can tell, it doesn't, ixmicro folded before OS X came out, so there aren't even drivers for it.

I have yet to test it under OS 9, as I've just been using the ati card so far.

I just overclocked the processor to 400mhz and its working just fine, so now I'm gonna try 450mhz, but I'm afraid to try 500mhz though.