I have an Intel dx58so board, and it can do SLI (assuming I have updated the firmware). The problem is whether SLI cards will fit or not because I have a huge CPU fan (Mugen Scythe) in my case (Antec 902). I can't really check at the moment as I don't have access to the tower right now.
Where you thinking of 460's in SLI?
Also, I have never had an SLI setup before... and if it's too much of a hassle with too many problems, I think I'll hold off on that.