I've actually got the same card as you, that's why your post stuck out to me. I've got a day 1 reference XFX RX480. Every BIOS I had tried thus far was crapping out unless I dialed it back to 1300, but that's pointless since my card is at 1288 stock. I'm not much of an overclocker, so I'm just kinda trying random shit based off what I'm reading here. Here's hoping this works
EDIT: card seems to be stable, but I've got no HDMI sound, so I'ma try using DDU and reinstalling ReLive
EDIT 2: No dice on getting HDMI sound working, any suggestions? It sees all the sound devices in Playback Devices, but it says none of them are plugged in -_-
Sorry, I don't use HDMI audio. Believe it or not, I'm running an old PCI SoundBlaster Audigy. This sound card will still be pumping out audio when men are walking on Mars.
Only suggestion would be to try the other HDMI ports. Maybe also try switching the default output devices.