I have a Powermac 1 GHz with an Nvidia GeForce4 MX. (Note: the desktop 
machine, not one of the portables.) I have yet to see a report of 
success getting X to run on one of these. Anybody here have this 
configuration successfully working? What kind of video quality are you 
getting?

(please reply directly to me, I'm not subscribed to this list.)