so i just got this fan in the mail
http://www.amazon.com/Delta-TFC1212DE-PWM-120mm-Speed-Sensor/dp/B008NZSUPQ/ref=pd_cp_pc_2i put it on the back and its running full speed.. its not doing pwm.
any ideas?
so i thought that it was maybe overloading the fan controller, so i pulled the tac and pwm wire from the plug and plugged the fan red and black wires directly into a molex adapter.. and plugged the yellow and blue wire into the board on the s5.
the s5 sees the fan, spinning at 4800 rpm.. but its not adjusting the speed.
oh and i might have another problem, when i picked up my s5 this was on the floor.. it looks like it was there for awhile.

edit..
so after checking around, and plugging this fan into my motherboard with the molex adapter and pwm on the board.. it seems this fan has an inverted pwm controller.. 100% is 0 and 0% is full speed..
im not sure if this can be switched in the software of the s5.. or any other way.