You want the Intel X16 SLI drivers for this chipset.
The X16 refers to the number of PCIe lines connected to each graphics slot. I believe this chipset uses two X16 PCIe slots to run SLI mode.
The other Intel drivers are for the 550 Ultra chipset which cannot run SLI mode.
You do not want to use the 680i drivers and you cannot use any of the AMD drivers.