Noticed that machines with Voodoo3 cards do not get a 'Customize X' button during graphical or text install, while Mach64 cards do.
Same situation with voodoo banshee cards.
This is to work around the fact that the voodoo cards would routinely corrupt the display when tested. There is a known problem running 2 X servers simultaneously with these cards with XFree 4.0. Hopefully these drivers will stabilize over time.