yes

fast algo is HARD. and you card or powersuply not work more than 10 min withz  16680mhz/1100.  this is it.
You fan work with 100% and after 10 min  HBC mem broken and reset. i see your temp. 2 card have 60+C more(on heavy) . and this is problem. 1 gpu  HBC broken and  rig go in reset
put gpu down and try.
 stop ask .on this topic nobody have 12 vega in 1 rig(and we are not talking about vega Liquid) .and nobody help you.
you have to find a solution and then divide them with us


how many HR in FAST? i have 4050-4100. you 5000?- and how much electricity do you have?

and you not wrtite any. I not see gpu mhz/mv and mem mhz/mv.