  We investigate complete noncompact Ricci-flat manifolds which are not of
maximal volume growth. We show that the manifolds with a curvature decay
condition and a holonomy decay condition are asymptotic to torus fibrations
over ALE spaces. In particular, we classify complete noncompact 4-dimensional
hyperk\"aler manifolds by the volume growth. As an application, we give the
uniqueness of tangent cones of collapsing manifolds with some conditions.
