Yellow wire on case fans

Xander2061

Xander2061

Xander2061

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Couldn't quite see this covered in another post so here goes.

I have just bought myself a new fan controller, and i want to use it to control 4 fans. CPU, GPU, HD fan and rear fan. All of my fans except the HD fan have three wires, a red and a black for the power and then a yellow one which seems to be responsible for relaying the speed of the fan to the controller. Is there any way of modifying my HD fan s that it can do this too?
 
I very much doubt it. And if it is possible to modify in some kind of RPM monitoring system, then it'd be too much effort to be worth it - you could just buy another fan. :)
 
the yellow is just an "sense" line which basically let you read the fan speed and has nothing to do with regulating the actual speed :) you can just connect that fan to the controller like any others ;)
 
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Xander2061 said:
Does the yellow wire always provide feedback? The on from the fan on my Radeon x850 pro is hooked up to my fan controller, but I'm getting no feedback.
Click to expand...

For the yellow fan to work there has to be a pulse sensor in the fan. Every time the fan rotates, it makes a contact and the yellow wire beomes 'live'. This pulse is picked up by a counting device somewhere (in your case - the fan controller) and these counts are converted into rpm.

If your X850 GPU fan has 4 wires, then the yellow one probably won't work with your fan controller as 4-pin fans are high-frequency PWM fans and work in a slightly different way.
 
thanks for the info. My fan has three wires, not four. Actually the third is white and not yellow, i connected it to the yellow wire on my controller though and it works fine, except for the feedback.
 
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