You can run Multiple Display with SLI, but what is going to happen is that its going to paint one display with one GPU, and the other display with the other GPU.
Yeah you should be able to clone, at least I could on my 6800 GT.
Yeah, If you enable SLI then you will only be able to get one monitor to work. You can disable SLI and run a different image on each screen or the same image.
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