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Wow that's an old board...The bandwidth is there, but why do you want to use dual RX 480s instead of a single XFX R9-FURY-4QFA RADEON R9 FURY X 4GB? On paper dual RX 480s have more power, 10.2TFLOPS vs 8.2TFLOPS, but the Fury X is $350 vs 2x RX 480 which are $500. A single Fury X also draws less power than dual RX 480, 275w vs 300w. The RX 480 is a mid-range GPU and has a "known issue" with a cut down back end and it suffers when AA is applied. Also, DirectX 12 games do not scale well or even at all unless they are programmed to take advantage of DirectX 12 MultiGPU, which isn't the same as the techniques DirectX 11 and earlier use, so in the case of, say, Battlefield 1, there is zero scaling in DirectX 12. To equal the power of a single Fury X you would have to achieve 62% scaling, which doesn't always happen.
So really you are much better off going with a single R9 Fury X than dual RX 480s