To anyone still having a problem with sli:
No new info just making a report. I don't run sli, but I was recently ripping my hair out trying to help a friend out with his new GTS 250's. I then found this post: viewtopic.php?f=46&t=2396&start=10 and it worked like a charm. Might be old news to some, but to anybody still having trouble - give it a try. If your still having trouble, reply and I'll try to help.
max