Given how poorly the 480 scales, especially above 1400MHz, I doubt it would make any difference.
False. The RX 480 scales better than gtx 1060. The RX 480 nitro+ at 1420 mhz is faster than GTX 1060 gaming X at 2100 mhz. And you wouldn't get much of that gtx but in the 480 1500 - 1600 is possible.
Also the fact that those less than 100 mhz OC in the nitro compared to the reference model give 9% performance boost is other proof.