While I thinks it's valuable and important to get the 2nd fan operating correctly, I'd be stunned if it actually made it quieter. It might make it more tolerable, but I've yet to see a situation where a 2nd fan ever made anything quieter. The hot air and noise are to be expected when you have 1200W being generated inside an envelope that's roughly S5 in size. Bitmain can't alter the laws of thermodynamics it would appear.