Egg Zactly what I would do, think that chipset was back when all cards were only 8X and just
x16 ready. A board with the 680i chipset will be fine. The 780i 790i is for tri SLI (openGL 3) and
the new 9 series cards which you don't need. Never looked into intel chipsets for a SLI board
so no comments about them, but intel is good. As for the new 700 series with PCIe 2.0 you
get into the same dilema, have to go 790i for 2 x16 in SLI. Don't know why they do that, but the
700s are backwards compatible with PCIe 1.0 cards that's something at least. BTW you never
mentioned you CPU, when building a SLI system one should never scimp on the CPU. Get the
fastest core 2 you can afford, hope you did. With lesser CPUs going SLI can cause what they
 call CPU Bound, the cards end up waiting on the CPU to catchup. Good luck, hope everything
works out for you.  8-)