I have the same motherboard. You have two options. You can patch your kernel with the
forcedeth patch and then recompile it.
You could also(which would probably be easier) install the drivers provided by nvidia. Download the appropriate rpm for your Suse version from
here. Install the rpm package and then do as root:
modprobe nforce
You should be okay after that but you may have to restart your network to pick up an IP address.