nVidia Driver, Control Panel for Power Mac G5?

My new Power Mac G5 comes with a very nice nVidia based graphics card. I have just switched over from Windows and Linux, where I also had an nVidia graphics card. In Windows and Linux at least, nVidia provides the driver and a control panel sort of application that lets you fine tune how the driver operates. This doesn't seem to be the case on the Mac... or does it?

On the Mac, do you have any access to and control over the driver for the nVidia graphics? I did a Spotlight search for anything with "nVidia" in it, but I came up dry...