Okl, finally i found a solution myself... with the driver of nvidia
here is the xorg.conf file:
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (@builder29) Fri Dec 2 13:57:21 PST 2005
Section "Extensions"
Option "Composite" "Disable"
Option "RENDER" "Disable"
EndSection

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection

Section "ServerFlags"
# Option "Xinerama" "On"
Option "backingstore" "true"
EndSection

Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "/usr/openwin/lib/X11/fonts/Type1/"
FontPath "/usr/openwin/lib/X11/fonts/Speedo/"
FontPath "/usr/openwin/lib/X11/fonts/misc/"
FontPath "/usr/openwin/lib/X11/fonts/75dpi/"
FontPath "/usr/openwin/lib/X11/fonts/100dpi/"
FontPath "/usr/openwin/lib/X11/fonts/Chinese/"
FontPath "/usr/openwin/lib/X11/fonts/Xt+/"
FontPath "/usr/openwin/lib/X11/fonts/F3/"
FontPath "/usr/openwin/lib/X11/fonts/F3bitmaps/"
FontPath "/usr/X11R6/lib/X11/fonts/misc/:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
EndSection

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "IA"
Load "Xst"
Load "bitstream"
Load "glx"
EndSection

Section "InputDevice"

# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/mouse"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

# generated from default
Identifier "Keyboard0"
Driver "keyboard"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection

Section "Monitor"
Identifier "Monitor1"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Option "TwinView"
Option "MetaModes" "1280x1024, 1280x1024"
EndSection

Section "Device"
Identifier "Device1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Option "TwinView"
Option "MetaModes" "1280x1024, 1280x1024"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 8
SubSection "Display"
Depth 8
Modes "1280x1024" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Device1"
Monitor "Monitor1"
DefaultDepth 8
SubSection "Display"
Depth 8
Modes "1280x1024" "1024x768" "800x600" "640x480"
EndSubSection
EndSection


"Michael Halada" schrieb im Newsbeitrag
news:43a66d7d$0$1157$5402220f@news.sunrise.ch...
> Hi
> this video card does have 2 connectors. How can i activate them to have 1
> big desktop 2560x1024?
> Either with Xsun or Xorg. Can anybody place a sample config file OWconfig
> or XF86config ?
>
> Nvidia has a driver at
> http://www.nvidia.com/object/solaris..._1.0-8175.html but it seems
> not to support my GPU.
>
> Any support appreciated.
> Thanks
> M.Halada
>
>