It is panic that has no doubt being created by parties to try and hurt AMD sales.
The facts are all modern PCI-E gaming cards can and do exceed PCI-E limits on the voltage, we have not seen any failures on motherboards from this at all for past several years. All the current NVIDIA and AMD cards can draw more than PCI-E limit and no damage has being caused.
It is nothing new, but for some reason some select individuals trying to make it sound like a bigger problem than it is and one which only effects RX 480 when in reality all cards are equally effected.
I would not worry, of course some people will still be frightened by such scare mongering and as always we pride our selves on customer service so anyone who does not want to chance it can simply return their card, but cards such as 960, 970, 380, 390 etc. can also draw more power than PCI-E specification and no one made so much noise about those cards.
Also AMD have already announced a fix for those who want to stay within PCI-E regulations and the driver that resolves this shall be released on July 5th, so there really is nothing to worry about.