Im sorry to tell you that, but its very unlikely that there will ever be driver for XGI Cards. Those cards are quite rare, as far as i now, because XGI couldnt establish itself as a competitor of NV and ATI. As there are no real macs with XGI Cards, there are no kexts which could be edited as workaround. Making a driver from ground (as np_'s macvidia when they are finished) is much and long work, which i doubt anybody wants to do for a very small group of XGI users.....