Xabregamers reports that the Xminator drivers indeed seem to support the SiS 315 as well. These drivers not only come with newer DirectX and OpenGL drivers, but also improve framerate and image quality compared to the latest official SiS 315 drivers.

This is good news indeed for SiS 315 users who feared to be forgotten by SiS with the release of the Xabre... Who would have thought SiS would come out with unified drivers like nVidia? Taken from the installation INF of the Xminator Xabre drivers