My gpu is 48C and fan is 0%  according to phoenix miner program. (I have set target temp 50C).
 
But I also have set minimum rpm. Is the fan completely shut off when my  mining program shows that the fan is 0%? Or is it 0% compared to what  minimum fan speed is. That it is actually 500rpm (0%) and max is 2400rpm  (100%) ?
I cant look at the gpus because they are boxed in and safe outside.