NVIDIA announced it will offer SLI support on the Intel X58 chipset via a driver but according to FUD Zilla this deal will not be available on the AMD platform because NVIDIA rather sells its own chipsets for AMD processors:
We were told that AMD won’t be able to participate in this SLI software licensing program, simply as Nvidia chipset boys see AMD's chipset division as competition. Nvidia also told many journalists that it still hasn't changed its mind about making a Bloomfield / Core i7 chipset and therefore it wants to give SLI to early Nehalem adopters.
AMD is considered a competitor in the chipset business and Nvidia still wants to keep SLI for itself as it sees this as a good selling point for its own chipsets.
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