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When it was first announced the RX480 could do ~5Tflops, but it ended up at 5.8 Tflops (which is closer to 6Tflops)
It seems that AMD upped the clocks a bit hence the bigger power draw and higher temps.
Araxie is likely correct. I'm too lazy to do the math. But initial leaks pegged the card at 1080/1266, not 1120/1266, and that may have played a part. It SEEMS like AMD was still playing with the clocks the last few weeks to get the card where they want it.