Don't know why there is no love at all for the fans 
I replaced the cheap china fans and did some hours of testing. Fan settings of gpu were on automatic, cards temperture went down at least 15 degrees without changing any settings. Even more impressive since the gpu fans were on 40% and run now on 25%. So overall the impact is even bigger. As soon as I can move the rig to a different location I'll set the gpu fans around 50% and should see easy temps below 50 degrees for my rx580.
https://imgur.com/TbNrG2p
I replaced the cheap china fans and did some hours of testing. Fan settings of gpu were on automatic, cards temperture went down at least 15 degrees without changing any settings. Even more impressive since the gpu fans were on 40% and run now on 25%. So overall the impact is even bigger. As soon as I can move the rig to a different location I'll set the gpu fans around 50% and should see easy temps below 50 degrees for my rx580.https://imgur.com/TbNrG2p