Any X58 motherboard maker can submit their board for certification, which will be done by NVIDIA. If the board passes, and the motherboard manufacturer agrees to pay a certification fee (NVIDIA would not reveal how much), then the board is certified and NVIDIA provides the board manufacturer with a key to place in its BIOS.
When you install the NVIDIA drivers, they check for the presence of this key in the BIOS - if it’s found, then you get the ability to enable SLI, natively, on X58. Note that this won’t work on any other Intel chipsets, just X58 for Nehalem owners this fall.
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