So I just recently bought a fan for my case. It was really loud. So I have been doing research to reduce the speed of the fan so it's not so loud.
If the fan is connected to the motherboard is there a way to control the RPM of the fan by use of software? I am talking about the standard 3-wire fan connector (red, black, yellow). It seems like the motherboard might have the ability to control the voltage supplied. Or it could apply a duty cycle. I know this is somewhat possible because the cpu fan (4pin) is temperature controlled.
I did find a way to adjust the speed by rewiring the fan, from this website: http://www.hardwaresecrets.com/article/496/
. Using 5v, 7v, and 12v. I can get RPM readings for the 5v and 12v settings, but for the 7v I don't get a reading. The only thing that I can think of is that the negative terminal is not connected to ground.
Am I correct in assuming that that is the reason?
I am aware of hardware addons to be able to vary fan speeds. I am just cheap and am not going to buy them. But I was curious, some of the items I saw for sale had dials. So I was wondering how they worked. Is it just a potentiometer? Not a big deal, just something I thought of while typing. Kinda curious.
So my 2 questions are:
Can I control the speed of my fan by use of software?
Why can I not read the RPM of the fan at 7v? (not grounded?)