I think you will struggle to find a motherboard with room for both Multi CPU (usually only for servers) and also multi GPU (usually only for gaming rigs).
Intel have a previous generation mobo that satisfies both those requirements called SkullTrail - maybe read up on that and see if they are doing something similar for X58 socket CPUs
Intel have a previous generation mobo that satisfies both those requirements called SkullTrail - maybe read up on that and see if they are doing something similar for X58 socket CPUs

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