I have an XFX Rx 480 4gb model. I had gotten it at Christmas and, for two weeks everything worked fine. However, now only one fan works and it is always on at 3700 rpm. From the moment I turn on my computer, to the second I turn it off, the fan is at it's fastest. I have tried to manually tweak the fan settings, I've moved it in to a different PCIE slot, and I've swapped out the PCIE cables. Nothing has seemed to work. Now, due to the card not being able to cool down, my computer has started to shut off randomly when playing games like Battlefield 4 and Witcher 3.
Ram: 16Gb PNY Anarchy
Mobo: MSI PC Mate H170A
GPU: XFX Rx 480 4Gb
Sounds like the cards fan controller is shot, contact XFX support.
Thank you, I just submitted a support ticket to them. Thanks again.