This is a new rig with 7 cards soon to be 9.
Running SMOS on a USB.
I have the cards set so the highest one is around 60 to 65c.
100/500 fans at 80%
These are MSI cards
They seem quiet. 50db at 3 feet
They feel warm. Around 115 degrees to the touch.
They run in my unheated 2 car garage and if I don't open the door daily
the temps push 90 degrees.
I've ordered an exhaust fan that I'll be installing soon so I can hopefully
push the power level a bit. Although 4Sol/w seems like a good tradeoff.

https://imgur.com/a/N798r