AMD gives an official statement in response to growing concern for Radeon RX 480 graphics card violates PCI-Express power specification, by overdrawing power from its single 6-pin PCIe power connector and the PCI-Express slot. Combined, the total power draw should be 150W. However, many found out that it draws well over that power limit.
Previously AMD has put out-of-spec power designs for Radeon R9 295X2, which draws more power than specified, but R9 295X2 was targeted users who should have good PSUs. Now the RX 480 is targeted to budget users, so this could be a big problem for them. AMD acknowledge this issue and preparing a driver update to fix it. You can read AMD’s statement down below:
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 8 Gbps 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).