Running the Firestreik Ultra I get this score:
http://www.3dmark.com/3dm/21550922?
I get 4961 points with a Xeon E3 1230 V2.
Looking at leak,that would place the Vega64 at least at higher resolution around 10% above my GTX1080 FE,or roughly around aftermarket GTX1080 performance.
If your 1080 FE is running at 1898Mhz, like it says, then its running the same as AIB 1080's.