The power is so much that it came close to 90 W at Tom’s Hardware during stress tests and has already taken a significant place at the Reddit’s discussions.
Many reviewers including Tom’s Hardware guys had reported the issue before the review too and last day AMD showed up and quoted something like this:
As you know, we continuously tune our GPUs in order to maximize their performance within their given power envelopes and the speed of the memory interface, which in this case is an unprecedented 8Gbps for GDDR5. Recently, we identified select scenarios where the tuning of some RX 480 boards was not optimal. Fortunately, we can adjust the GPU’s tuning via software in order to resolve this issue. We are already testing a driver that implements a fix, and we will provide an update to the community on our progress on Tuesday (July 5, 2016).
It seems that AMD is going to solve this issue as soon as they can.