I use all PWM fans of same rpm range and control them all using PWM signal from CPU fan socket on motherboard. All idle and rev up with CPU demand for cooling.
If I change to a new GPU with PWM fan control I will use it's PWM signal to run some of the case fans.. Than as GPU gets hotter and increases RPM case fans will increase too.
My reasoning is CPU and GPU are the major heat sources in case and therefore major users of cool intake air and major source of hot exhaust air. If case air movement is synchronized to CPU/GPU demand system will be quiet when demand is low and increase in as load and heat increase.
Cooling on demand with only as much noise as need to keep things cool.
I don't have to remember to adjust fan controller before I put computer to work.. or need to get up to adjust them later when work is done and I'm watching a movie.Edited by doyll - 12/30/12 at 4:01am