Motherboards based on ULi chipsets, prior to nVidia's acquisition, by default did not have SLI support enabled or even functional. Now, however, you can download a driver
patch for ULi based boards that will enable the latent SLI capabilities. Assuming you are using the proper Detonators on a M1697 northbridge, the patch will detect it and apply itself accordingly. This is one of the few exceptions in which SLI functionality can be added after the fact, and is probably only available because of nVidia's acquisition. If you are using a ULi based motherboard and looking for an upgrade path, this may be one way.