I have a 2015 Retina Macbook Pro 13″ running Boot Camp Windows 8.1.
On default settings, the fan seems to idle at 0 according to "Macs Fan Control", and then slowly climb when it reaches 70℃ or so. Gaming makes it go around 102-103℃ max, and hover between that and ~90℃.
Lubbo's Fan Control seems better at gradually increasing and decreasing fan speed, but it as well as Macs Fan Control seem to stick the fan on always on with a minimum of 1299 rpm, once I enable them to override the stock fan management.
In deciding how to modify my system I wonder if OS X always keeps them running and if that is bad for the machine long term compared to windows drivers behavior?