However the fourth pin is what really makes a fan controller stand out.
Stand alone pwm fan controller.
Noctua na fc1 4 pin pwm fan controller black 4 7 out of 5 stars 485.
In case of overheating or the failure of a fan the other fans can be set to full speed.
That is the device functions as a fan speed regulator.
Software rpm mode can also be used to allow the amc6821 to operate as a stand alone device.
Auto temperature fan mode is an intelligent closed loop control that optimizes fan speed according to user defined parameters.
Each mode controls the fan speed by changing the duty cycle of a pwm output.
Free shipping on your first order shipped by amazon.
Electop pc chassis fan hub cpu cooling hub 10 port 12v 4 pin fan pwm hub molex controller.
Status information can be queried via a i c interface.
This mode allows the amc6821 to run as a stand alone device without cpu intervention.
Aqua computer quadro pwm fan controller with ambient backlight connector.
This model is otherwise known as a pwm model which stands for pulse width modulation.
Suitable for a 4 wire fan with pwm or control voltage input.
Basically it contains all of the necessary functions to make the engine start and run while also supplying any necessary signals from the computer such as speedometer and check engine light control.
Get it as soon as thu sep 24.
An engine management harness is pretty much what you will find from most wiring harness companies.
Can control status leds for over temp fan fail 3 3 v 5 v 12 v and 12 v.
4 2 out of 5 stars 249.
Uphere 5v 6 pack 120mm silent pwm intelligent control 5v addressable rgb fan motherboard sync adjustable colorful fans with controller t7syc7 6.
4 5 out of 5 stars 193.
4 7 out of 5 stars 56.
Built from scratch stand alone engine harness.
It isn t as complicated as it sounds it is essentially just an on off switch run cycle.
Software rpm mode is a second closed loop control.
In this mode the amc6821 adjusts the pwm output to maintain a consistent fan speed at a user specified target value.
The best i ve been able come up with has been the zalman pwm mate however as far as i can tell this has been discontinued.