There is a big chance that Intel doesn't want to allow Nvidia to run SLI, as it doesn't want to make a big thing about SLI on its own Conroe machines.More info over here.
Intel is in the bed with ATI and signed a cross-licensing agreement quite some time ago, the upshot of which is that it officially supports ATI's Crossfire on Intel 975/965 boards. We hear that Intel doesn’t want to let Nvidia's SLI to run on its boards, at least not officially.
Intel doesn't allow SLI on Conroe platforms
Posted on Wednesday, Jun 28 2006 @ 00:35 CEST by Thomas De Maesschalck