Re: complete system crash when i start x server
You may want to try one of the other AGP modes. Here's what each does, quoting from the nVidia readme:
Option "NvAgp" "0" ... disables AGP support
Option "NvAgp" "1" ... use NVAGP, if possible
Option "NvAgp" "2" ... use AGPGART, if possible
Option "NvAGP" "3" ... try AGPGART; if that fails, try NVAGP
Option 3 is the default if you don't specify a mode. I use option 2 with my Asus A7V8X-X motherboard (VIA KT400 chipset) and FX5200, you may want to see if that option works. You can view the file "/proc/driver/nvidia/agp/status" to see if AGP is working.
If not, try updating your BIOS (check with your motherboard manufacturer if your computer is self-built or your computer manufacturer if you bought it pre-made). Also, make sure you have the latest kernel update from YaST Online Update.
Also, note that even without AGP support OpenGL uses hardware rendering, it just lacks some speed-up features. Your setup is still much faster than it would be if you used MESA software rendering for 3D.