It’s been discovered that some Radeon RX 480 graphics cards are pulling more power from the PCI-Express slot than what is allowed by spec, which is 75W. In theory, going over spec could damage lower end motherboards and there have already been some claims of that happening. As a result, AMD is working on an updated driver to fix affected cards.

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Source: Hot Hardware – AMD Promises Radeon RX 480 Software Fix For Out-Of-Spec Power Draw, As Possible First Casualty Surfaces