Under water Vega hashes at 7.345Mh/s. But now on 33*C.
I made some testing under Windows. Normal settings for the cards in balance mode are 220W. And cards is throttling hits this power level. But you can set Power up to +50%. Than under full load I have 1630Mhz with 330W in some cases. Worth mentionned that getting 350W is no problem for the LC edition and VRM are able to delver more than 400W.
So the only way to get more H/s is to reflash bios from LC edition or maybe some improved ROCM release. Than, it shoud be around 8Mh/s.
Cheers:D
The gain of productivity is as a percentage equal to the price between cards on water and air? It seems to me that isn't present.