I'm not an expert, but there is no technological reason why they couldn't enable it. My understanding is that SLI could be enabled through drivers on any platform
The reason stems from a business standpoint. If they stand to increase revenue through BIOS licensing/board certification + nF200 sales on x58, there is no way they are going to enable it on x38 and x48 "for free"
We as consumers are still going to pay "Nvidia Tax". Even those that don't want it will probably have to pay extra$ for the board certification. Since the board certification is only a BIOS modification, not a hardware chip, it is unlikely mobo manufacturers will make several SKU's around "certified" vs "uncertified" - forcing everyone to pay extra - as the Mobo manufacturers will just pass along the any additional costs.
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