I have both and the fps was very low and unstable on both . no hate mate !
i know theres a version that uses different methods and is more stable but the creator has not updated it for c3 . its called stolfenwein 3d at the forums .
Should be in your downloads. I have added 2 new templates to the downloads with updated methods. You can switch from higher to standard res with the + key for more performance. The changes are fully documented.