While the nVidia 780i SLI chipset isn't blowing anyone away with a whole new level of performance, it does bring some nice features to the table. It adds full PCIe 16x support on all graphics card slots and enables 3-Way SLI on this board. Of course 3-Way SLI is also to be supported on 680i SLI boards, but with one card running on a PCIe 8x interface. Is this worth a model change though? Perhaps not by itself, but also bear in mind that the 780i will offer full Yorkfield support as well - where the 680i simply cannot due to hardware incompatibility.
Check it out at BCC Hardware.