Originally Posted by silvrr
Not exactly what I meant, could be your fan controller. Try running them without any controller, just power to the fan at full speed off the power supply and compare the sound to when a PWM source is used.
Yep, I plugged them into the motherboard, and the humming is gone. And my molex idea didn't work, so I've concluded that the problem is my fan controller.
seeing as how I don't have nearly enough mobo fan connections, I either have to make this fan controller work or send it back and get a different one. But how would I be able to make sure I wouldn't get the same problem?