You can use HWInfo 64 to log all the temps and fans speeds if you want to play with different case fan ramp up curves and see which is the best compromise - but as that sort of playing around isn't ...

Worth looking up the PWM curve and fan stop behaviour for your fans, as not all PWM fans are created equal. The stock fans in your case are the Aspect 14 PWM and the spec sheet for them from Fractal ...

Various axial and centrifugal fan performance curves will be illustrated throughout this article, with no attempt made to rationalize any particular selection. The most important characteristic of a ...