After playing with my MSI Vega 64 for two days I come to these conclusions:
Whoever fingered in the value 1200mV for default voltage must be shot. Fired first then shot. It is way too much for default air cooler and not necessary to achieve 1600 MHz clocks. -150mV and no problems so far.
Maybe not as extreme on the shot/fired thing but would have to agree. Unless there are some extremely bad chips out there the default settings just seem ridiculous.
With some pretty simple tweaks power usage goes down, performance goes up and you're almost looking at a completely different card. V.v.odd imo.