I have heard a solid report that Panther (OS X 10.3) dev preview
installed on a dual G4 800 Quicksilver with a GeForce 3 AGP card and a
PCI Rage 128 16MB board (for 2nd video display) does not effectively
support the Rage 128 as a display, only allowing 640x480x256-color video
on that screen (only option in Sys Prefs Display settings). Video on
that screen is a sort of very dithery greyscale.
This configuration apparently worked fine under all previous version of
OS X (including Jaguar) for full high-res/hi-color support of the Rage
128 board. (And despite the lack of ...