PWM Fans Loud

[Pistons]

Hey guys, I have a Phanteks Enthoo Pro case....by default it comes with 2 case fans, both 3 pin tied into a PWM hub within the case. The manual suggests to plug the 4 pin connector cable to the CPU Fan Header on the MOBO. I have an Asus Z97-A MOBO, but I used the CPU Fan Header for the CPU Fan and plugged the PWM connector to the CPU_OPT header on the MOBO. Now, the fans are running at 1100-1200 RPMs all the time and are quite loud. I am a noob lol, so I'm not sure exactly how to go about correcting the case fans so that they only run fast when needed. The MOBO I have seems to have quite extensive "cooling" capabilities through the BIOs but I don't want to tinker until I have an idea of what I'm doing.....ANy help would be greatly appreciated. Thanks.

 

[HEXiT]

pwm needs 4 pins if there 3 pin there rpm controlled or static rpm fans (dont increase or decrease rpm)
running rpm fans in pwm mode in bios will often cause them to get noisy. so try using auto or setting them to rpm.

 

[GObonzo]

check your BIOS or motherboard's software for fan control options. you should be able to create a "fan curve" profile to control what speeds the fans run at determined by the temperature of the components.