whole reply didn't post hmmmmmmm.

The MSI 680i board spec from the MSI webpage shows (   Support Dual PCI Express 16X
interface with either 1x16 + 1x8 or 2x8 operation.) so your basicaly in the same boat. MSI
seems to be cutting edges for cost. Go to the nvidia web site and in the SLI section you 
can get a list of SLI certified hardware, make you decision on that. I don't think these MSI
boards are certified, you want 2x -x16 PCIe in SLI bottom line.