The nforce rpm package only contains a sound driver (sound driver is in most modern distro's too: i810 audio driver). Next to a sound driver there's a network driver in the package but no ide drivers at all.
Perhaps raid works using the default stuff or else you are stuck. That happens when you buy a horrible nvidia mobo with about everything closed source. Intel, Amd, Via, Ali and Sis all provide the needed specs to create opensource drivers for the stuff on their motherboards.