Apparently there was a PC running one of the consumer Vega cards at the event marking the launch of the new AMD deep learning cards:
http://www.pcgameshardware.de/AMD-Ra...-1080-1215734/
http://videocardz.com/64706/amd-vega...possible-specs
Performance seems around the same as a GTX1080 in Doom. Also the card apparently uses a narrower 2048 bit memory bus instead of the 4096 bit memory bus in the Fiji based cards.