Tried a few different things with my motherboard fans to see if they where really effected by using a high or low speed and how much power my computer was pulling.
Found that if your just using computer for word excel and a bit of video watching you can just leave all fans on low.
I have a 
and two 6 inc fans on my computer so that might make some difference but they are however really really quiet and i do not here a thing.
