Had the problem but as you know 1027 fixed it. 
Ok good to know...
I had little stress becasue of this
I rushed this fan script not totally tested becasue new opt miner in deed took a lot of wattage.
It had only problem spinning it up, it was spinning but too slow
Anyway still i saw some single rigs with temps like 88 C so i am wondering why ...
Anyway i will focus on perfecting this temperature/fan speed becasue it is very important !
Its so much work to do fuck
It would be easier if i ask already people for 1$/rig/month - i could focus much more time
The problem that I have is that fans not working at all after miner start. Cards going up to 90 too fast .