I don’t know if this is nVidia sanctioned or not, but apparently the Forcware 84.43 drives seem to allow it on the i975X, according to a thread at OC Workbench.
[i]ur reader send us a note that the latest Forceware 84.43 now enables SLI to Intel 975X board. The screen shot below shows that it can be done. If it works, i975X can run CrossFire, SLI and Multichrome. It will also be able to run Conroe. Looks like it is the best platform so far.
- I have tested two 6600GT on i975x board and the SLI tab just don’t appear. Perhaps it might need certain combinations to work out.[/i]
Not perfect, but this makes things interested, especially since nVidia is/has taken over ULi.