OpenSUSE Hardware :: Alternative For NVIDIA Graphic Card Installation Correct?

I am new to Suse Linux. So please excuse me for this "funny" query. have read the threads: Configuring graphics cards in openSUSE 11.3

From here I went to this page: SDB:Configuring graphics cards - openSUSE Its mentioned on this page that: Upon installing openSUSE, the X system's automatic configuration may have failed to properly configure the graphics correctly. Typically this results in either a black screen upon reboot, or the wrong resolution being displayed on the monitor.

I have none of these problems. But after searching for inability of desktop effects to become activated, I found that nVIDIA graphic card drivers are must for these effects. After clicking "My computer" icon on desktop, I found Display Info as following:

Vendor: nVidia Corporation
Model: G98 [GeForce 8400 GS]
2D driver: nouveau
3D driver: nouveau Gallium (7.8.2)

Can anyone tell me 'Is nouveau an alternative for nVIDIA'? Is this the reason for no wrong resolution or black screen upon boot. That means my computer graphics are working correctly. Then why does Desktop Effects are not getting enabled.

After searching for Kaffeine media player extra codecs to play media files, I incidentally found the following options: I opened Yast Control Center @ linux-o26a Software> Add on Products > installed Add-On Products > Community Repositories > clicking Next, this opened a window with "List of Online repositories" where there is an option of "NVIDIA Repository". If I install it, will it enable the "Desktop effects"