Same problem, same card, solved by connecting a monitor (dummy), then the card itself awake to the full hash.
If it happens again, I will consider buying a dummy plugs for all cards, not only for one in rig.
Topic: RX 480 failing (Read 682 times)
It happened to me before, I thought that it was a driver problem, but I figured out that one of the riser moldex power chord has been burned, I replaced it and it backed to normal hash speed.. 
did you manually change the oc setting or hit the reset button in afterburner or actually delete that profile ? in the afterburner directly then try . you may even need to delete all profiles including the ones in windows in the driver storage folder for windows if it's not a PSU issue.
does after burner hold the default settings after you change them or does it go back to the under clock setting ?. did you try that card buy it self with no other card to see if it hashes OK ?.
does after burner hold the default settings after you change them or does it go back to the under clock setting ?. did you try that card buy it self with no other card to see if it hashes OK ?.
is it a monitor connected card? if it is, try to reconnect it couple of times. i know that sounds weird but i had this issue with my nitro+ 480 8g, and it helped. think of some driver bug.
Check your Power supply, riser connection. Make sure everything connected well
You could try running ddu from safe mode to uninstall the drivers, then reinstall. If that doesn't work, try a different driver / miner version.
My rig has been mining without issue for two weeks, and today after i restarted the windows and started the miner (claymore zcash 9.0) i see that one of my cards (XFX RX480 8GB/no bios mod) is capped at 45H/s, the other 4 are running at 210H/s with temperatures of 73º tops, i checked the bat file and everything is in order, i even tried with an older version of the miner and i get the same problem, i swapped the riser of that card to a different pci-e port, checked the power connection from the PSU to the card and everything seems to be in order, even reverted the overclock i had with the afterburner (mem clock from 2000 to 2150mhz) to stock. Ran out of ideas, any suggestions?
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