The 20" ACD seems like a good choice for my Dual 800 at some point as it is still stuck with an Applevision CRT for now. However one thing that I need to be clear on, does this screen not work with Mac OS 9.2.2? Im guessing that this is because the Nvidia/ATI drivers in OS9 haven't been updated to include support for the new resolution of this screen (hence why the 17" and 23" screens can still be used). If this is the case, would the screen just not work at all, or would it just use a lower resolution (non-native)?