OK, I'm confused now.
I managed to download a package from rpmfusion.org
and install it.
I now have the following configuration options available in gnome.
Applications->System Tools->NVIDIA X Server Settings
The Screen Resolution option tells me that the monitor is Unknown, with a
maximum available resolution of 1024x768 and 50, 51, 52, 53 and 54Hz refresh
rates only. The Detect Displays button does not make any changes. Reducing
the display resolution worked immediately on apply, but trying to put it
back to 1024x768 failed, although restarting allowed the display to revert
The Display option allows changing the resolution lower than 1024x768, but
requires restarting X-Server to apply the changes. After a restart and
changing to 800x600, the highest resolution available is 800x600. Manually
editing the /etc/X11/xorg.conf file and adding in a number of missing
resolutions, and restarting, I can change the resolution in the Display
application, or in the Screen Resolution application. Again, changing the
resolution in the Display application reduces the list of possible
resolutions to the one selected.
Using the Display application, I can force the monitor model and make, but
the information is not added to the xorg.conf file.
The NVIDIA X Server Settings application allows me to see the correct
graphics card and monitor, both automatically detected. Changing the screen
resolution and saving to the configuration file appears to work and reports
that X-Server needs to be restarted, but there is no change in resolution
when the system restarts into gnome.