For those of us who have Vega Cards, we have had to use the old Blockchain drivers from August 17 in order to maintain full speed against Cryptonight based coins. Finally, the changes is here!
From Adrenalin 18.3.4 you can now maintain at least the same speed, actually you should be able to provide a slight boost at same wattage, the new drivers are slightly more efficient. We where able to run the Vega 64 smoothly on 2khs @ only 156w !
Please note that the soft power play / registry mods will not work with these drivers, and they’re not needed any more. You can use OverdriveNTool to finetune your card(s) now.