I have Ubuntu 12.10 and am running a P4 2993 MHz with a onboard Intel graphics card. I've then installed my Nvidia n6200 video card by running:
sudo add-apt-repository ppa:ubuntu-x-swat/x-updates sudo apt-get update sudo apt-get install nvidia-current nvidia-settings
I can get it to work but it thinks I have a laptop and will only display resolutions in 4:3 ratio. Also my monitor is a Samsung 20 or 21 inch, can't remeber which one atm.