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I already posted how to reduce voltage on HiveOS. My cards run supercool and at 140-150W each.
Where? For Vegas?! 150w?! and 6Mh?! and supercool?! impossible)) I can find you posts about that...
Please write again here..
Ah missed the Vega part. Sry man, I am tired, to much to read and to do

I guess Vegas don't work with Hive?
But you could basically just use the tool I used on hive to adjust the voltage and clocks right? Or am I missing something.