I replaced my rx480 with vega56 today. \o/
Device Mangler says it's an 'Unknown device'. Radeon Control Panel won't open, says "Radeon Settings are currently not available. Please try again after connecting a display to AMD graphics"
Card is working (I don't have integrated graphics) resolution is 2560x1080 on my widescreen monitor.
I have 750watt PSU but maybe my watercooler isn't leaving enough juice for it?
ASUS Sabertooth 990FX
LG Widescreen using Displayport
I installed the latest radeon software: 17.9.1 and it recognized the card.
all is well.