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how does a mobo control speed via 4 pin connectors?

Posted: Mon Apr 06, 2009 11:36 pm
by gbyss00
How does newer mobos with 4 pin connectors vary fan speed?

will this wiring be enuf for a mobo to control the fan speed?


img19.imageshack.us/img19/4523/dsc01791resize.jpg

Re: how does a mobo control speed via 4 pin connectors?

Posted: Tue Apr 07, 2009 5:23 am
by psiu
gbyss00 wrote:How does newer mobos with 4 pin connectors vary fan speed?

will this wiring be enuf for a mobo to control the fan speed?


img19.imageshack.us/img19/4523/dsc01791resize.jpg
No, the 4 pin via motherboard fans are PWM fans, they use 12V bursts to control the speed rather than adjusting the voltage. There is a specific pwm control wire for them.