I presume you mean that you've got a X display working but with the XFree driver rather than the NVidia one (and therefore no accelerated OpenGL)? Or have you actually got the NVidia driver working?
I run RH9 with no problem on my X10 with the XFree nv driver for X. The problem with garbage on the console after you exit X was fixed with a tip from:
What I am still very frustrated about is that I can't run accelerated OpenGL on my nice graphics card..... still waiting for an updated driver from NVidia along with many others.