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Fan Connection

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November 24, 2010 9:22:42 PM

im mid way through a pc build and im wondering if i can plug a 3 pin fan (cpu or case) into my motherboards 4 pin connector

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a b B Homebuilt system
November 24, 2010 9:30:08 PM

Yes, not a problem. The connection should only let you plug it into the proper 3 pins.
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a b B Homebuilt system
November 24, 2010 9:30:10 PM

Yes

2 seconds too slow
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November 25, 2010 3:37:33 AM

why don't you try it and see if it works...most likely it will
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a b B Homebuilt system
November 26, 2010 12:50:35 AM

Yes, it works. But you'll have to see what kind of fan speed control you can get. 3-pin fan ports achieve speed control by supplying to the fan a variable voltage. 4-pin fan ports supply a fixed full 12 VDC to the fan, and then add a PWM signal on the fourth line that the fan uses (via its own built-in circuitry) to slow the fan down to the right speed. So a 3-pin fan on a 4-pin port will run all the time at full speed.

The exception to that is that some mobo's have a BIOS option for their 4-pin fan ports that allows you to tell it to change to 3-pin control mode and use the variable-voltage system instead. Some may even do this automatically. But some cannot, and you get full-speed fan at all times. Works, and cools well, but a little more noisy than a speed-controlled fan.
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December 2, 2010 1:08:51 AM

Best answer selected by sk-jb93.
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