Generally with AMD, you can Crossfire cards as long as they are based on the same chip. The RX 470 uses a cut-down version of the same chip as the RX 480, so they should be compatible.
Generally with AMD, you can Crossfire cards as long as they are based on the same chip. The RX 470 uses a cut-down version of the same chip as the RX 480, so they should be compatible.