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HP Chassis 3 pin fan and Asus 4 pin motherboard?

Last response: in Components
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December 24, 2013 8:30:35 AM

Hi all, I have an Hp p7 1245. The chassis fan is 3 pins. My new motherboard installed inside is 4 pins. Is it safe to put my chassis's 3 pin fan to my ASUS's 4 pin motherboard?

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a b Ĉ ASUS
a b V Motherboard
December 24, 2013 8:34:19 AM

Yes, it is safe to use your fans on the board. The 4th pin is used to change the speed of the fan, it's not necessary for the fan to run.
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a b V Motherboard
December 24, 2013 8:36:42 AM

If you look at the 4 pin fan header on the motherboard you will see that it also accepts 3 pin fans. This will work fine for your system.
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a b Ĉ ASUS
a b α HP
a c 154 V Motherboard
December 24, 2013 9:30:24 AM

Yes, your fan will spin.

Also, some fans can be controlled by the motherboard. This requires three things:

1) Variable fan
2) Motherboard fan control supports the fan (in this case the fan is Voltage)
3) Fan control software

I suspect your case fan is non-variable but if it's not then you MAY be able to control it via the motherboard fan control software (which you should already use for your CPU).

Optionally you can REPLACE the fan with a variable one if desired, in which case I recommend something like a 500RPM to 1800RPM (variable), PWM, 12cm fan if that would fit.
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December 24, 2013 11:12:30 AM

hi all, I installed the chasis fan and when I start up my computer, the screen said "Windows system repair (recommended)" And now my screen is performing system repair. Could my chasis fan be incompatible?
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December 24, 2013 11:18:24 AM

Hmmm after waiting for 5 minutes the computer is running perfectly fine now. Weird how I went into System Repair after connecting my old chassis's fan to my new motherboard o-o
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December 24, 2013 12:05:57 PM

By the way, is my fan being automatically put on 100% speed? My chassis fan is considerably louder now.
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a b Ĉ ASUS
a b V Motherboard
December 24, 2013 12:43:43 PM

Willy156 said:
By the way, is my fan being automatically put on 100% speed? My chassis fan is considerably louder now.


It will run at the same speed as it did in your last case, unless you had a fan controller.
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December 24, 2013 1:26:10 PM

I did not have a fan controller and my old motherboard had 3 pins instead of 4 pins. My new motherboard is currently using my old chassis fan and is louder
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