AFAIK if the NF100/200 chip is detected it basically gives SLI a free pass for all configurations. (Atleast that used to be the way as an incentive to try and get manufacturers to put them on their X58/P55 boards). Not sure if this counts when the splitter is on the GPU tho i.e. GTX295 on a non SLI motherboard - I'm guessing that wouldn't then let you use the other lanes in SLI configuration.
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