Ubuntu is recognizing your Nvidia video card driver otherwise it would not be able to activate it and you would not be able to have a 3D desktop.
It is System Info that is not recognizing the video card. It is my guess that this is because the Nvidia driver is proprietary code and not open source code.
I get the same information from System Info on my machine with Nvidia Geforce GT220. Accept this as the present situation regarding proprietary video drivers.
Last night I ran a test on a default install of 12.04 Beta 1. I deactivated the Nvidia driver and I re-booted. I got a 2D desktop running under the open source video driver called Nouveau.
In 12.04 System Info is called Details. The details of my graphic set up under Nouveau are:
Graphics: VESA:GT216 Board-0682vb12
Driver: 0682vb12 Experience:
Notice, that the graphic experience is listed as standard. This means 2D. In 12.04 you can confirm this by running System Settings>Appearence. If you see a method of adjusting the Launcher icon size, then you are in 3D. You do not get (at present) a method to adjust the Launcher icon size in 2D.
When I re-activate the Nvidia driver, Details (System Info) says:
The experience is standard even though I know I am in 3D mode. I can see the effects. Therefore I conclude that System Info at present cannot get information from a proprietary video driver because it is closed source code.
For your information, the video card that you have is a key component for having a good visual experience in any operating system.
You do not give us your hardware specifications. Does your video card have a powerful GPU (Graphic Processing Unit)? How much video memory is on the card itself? This can make all the difference to a user's visual experience.