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Can I plug a 3 pin fan into a CPU fan header?

Last response: in Components
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a c 94 à CPUs
July 1, 2013 10:23:31 AM

Yep, just want to know so that I decide where to put my fans in my case.

The CPU fan header is 4 pin (just if you didn't know)
a c 112 à CPUs
July 1, 2013 10:29:34 AM

yes but you wont be able to control is speed because it lacks the pwm sync wire.
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a c 94 à CPUs
July 1, 2013 10:31:44 AM

HEXiT said:
yes but you wont be able to control is speed because it lacks the pwm sync wire.


Ok, at full speed (12v) the fans run at around 1000RPM so that isnt much of a concern. Sounds silly but what is the difference between a CPU fan header and a chassis fan header?

Is the CPU fan header just conveniently placed for a heatsink?
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a c 112 à CPUs
July 1, 2013 10:44:29 AM

like i said the 4th pin is a pwm syncing pin. the extra pin sends a pulse pattern to the fan switching it off and on. the space between the pulses allows the fan to slow slightly so you increase the frequency the fan speeds up if you space them out the fan slows down...

1 thing you may notice if bios has pwm mode set and your not using pwm fans. you may get extra motor noise from the fans. to stop this just turn pwm mode off in bios.
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a c 94 à CPUs
July 1, 2013 10:47:00 AM

HEXiT said:
like i said the 4th pin is a pwm syncing pin. the extra pin sends a pulse pattern to the fan switching it off and on. the space between the pulses allows the fan to slow slightly so you increase the frequency the fan speeds up if you space them out the fan slows down...

1 thing you may notice if bios has pwm mode set and your not using pwm fans. you may get extra motor noise from the fans. to stop this just turn pwm mode off in bios.


Ok thanks :D 
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