I think I do! So your mobo just decides on the speed itself depending on the temp? Unless my fans are just loud there is no reason for the PC to be this noisy, especially as it doesn't change when playing BF4!
I currently run 5 akasa pitanhas in this way, 2 on the cpu cooler and the rest as exhaust at rear and top. My 4 intake fans are a bit of a mix and ran via an akasa fc six fan controller. Ill be ditching it though as it has a weird buzzing problem.