As for the rest of it: They can push the Vega FE to 440 watts of consumption but that only puts them in the same neighborhood at a GTX-1080 in gaming benchmarks. Yes, OMG Drivers, they already know that so this isn't the final verdict on Vega in games. However, while drivers can improve game performance, don't expect drivers to massively cut the power consumption of the exact same piece of silicon running at the same clocks that PC Perspective tested. Removing half of the HBM2 could cut some power, but it ain't going to be 100 watts of power.
However, on a non-gaming benchmark this was somewhat concerning:
As for there being no professional tests in this review – I apologize for the time constraints. I tried to run LuxMark on this card in both 300 and 350-watt modes and it soft rebooted the system multiple times in each mode. Not sure what is going on there but I have inquiries in with AMD and will be doing more investigation on our side. Once stable, I would expect the same ~10% improvement in performance moving from the air-cooled Vega to the 350-watt water-cooled version.