Hi I'm planning to upgrade from R9 270, can my motherboard handle 2 Polaris RX 480 GPU via crossfire?
It will support it, but not well. The second card will run with significantly reduce bandwidth as the port is only connected at x4 mode.
Source: GIGABYTE - Motherboard - Socket FM2+ - GA-F2A88X-D3H (rev. 3.0)
Can it handle it? Yes. BUT the PCIe 2.0 x16 slot operates at x4, meaning there will be a performance reduction, but the performance reduction from using a weak FM2+ processor will exceed that, so my advice would be to not do Crossfire.
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