Thank you for your reply. Yes I've tried several.
One thing I've come across while Googling the trouble though said that brushless fans are iffy as to whether or not they'll respond to PWM control (the writer claimed that they shouldn't work at all). No idea how much or little truth there may be in this, but all of the fans at my disposal are brushless.
Edited 1 time(s). Last edit at 08/14/2017 03:18AM by papilio.