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Can this be done with the new 790i? Or will it be implemented later?
You mean GX2 right?
In any case, it's not possible. The GX2 does not have a second SLI connector like the 8800GTX and Ultra had. In addition, SLI drivers only support a maximum of four GPUs. Two GX2 in SLI have 4 GPUs between them. So a third GX2 card wouldn't be possible.