Anyone have an idea on how I can reduce power consumption? I have two rx 580 sapphire nitro special edition cards and one msi rx 580 OC 8GB. The nitros are pulling huge power and it seems like my cards don't respond to an undervolt or -% on power.
Undervolting is the only way to significantly lower the power consumption.
What kind of adjustments need to be made if my 580s are crashing the miner?
Decrease clocks and/or increase voltage. That's the usual stuff to make GPUs stable.