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connect fan to psu, control thru mobo?

post #1 of 5
Thread Starter 
I have some high-performance fans that I want to power through my psu rather than my motherboard. However, I also want to control fan speed, without using a fan controller. I have a bunch of 3-pin-to-molex adaptors that came with some of the fans, they look like this:



Basically, red and black wires from 3-pin adaptor go to molex, yellow wire from adaptor goes to a 3-pin connector that fits motherboard fan sockets. Can I plug my fan into the adaptor, and hook that yellow-wire connector up to my motherboard and control fan speed, while plugging the molex into my psu to power the fan?
post #2 of 5
The yellow wire is just for speed monitoring. The red and black are power and ground, respectively. Wired up they way you stated, the fans would still run full speed. You'd just be able to monitor the speed through your mobo.
 
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Da Bestest Juju
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post #3 of 5
you need a 4 wire to control speed. correct me if im wrong though.
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post #4 of 5
Quote:
Originally Posted by Mr. Mojo View Post
The yellow wire is just for speed monitoring. The red and black are power and ground, respectively. Wired up they way you stated, the fans would still run full speed. You'd just be able to monitor the speed through your mobo.
2nd this. Connecting your fans directly to the PSU will run them full speed. To get speed control you will need a controller, potentiometer or some type of voltage adjustment switch between the 12v source and fan. The yellow wire is only for RPM signal.
post #5 of 5
Thread Starter 
Thanks guys...that's what I was afraid of. Thought maybe they got around the 4-pin, but I guess not. +1 for help.
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