Hi List,
good news for everyone who wants to use more than one Nvidia Card in F12: I found a solution to my problem in this Post:
In short you have to enable the rpmfusion testing repositories and install these packages:
yum --enablerepo=*testing* install kmod-nvidia xorg-x11-drv-nvidia-libs xorg-x11-drv-nvidia-libs.i686
Works great for me!
Now i am just having small problems when i boot up in runlevel 3, i don't see anything after udev starts, until i start X. But i think there will be a solution for that also.
Regards,
Florian