Can i manually control the speed of my two 3-pin case fans if they are plugged in 4-pin slot? New to pc's - Pls help! :)

Nicko_Bellic

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Jul 5, 2014
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Hello everyone.

So as explained in the title, i just bought today 2 x Coolermaster Sicleflow 120mm case fans. My motherboard only has 4-pin slots. So i plugged them in the PSU with the cables provided and they run 100% all the time. The problem is that they are too loud and after 2 hours of working, the headache is certain. I want my pc to run quietly when i do light work but when i'm gaming and i want good airflow, i don't really mind for the noise as i wear my headset.

So my questions are:

1) Can i plug the 3-pin fans in the 4-pin slots in the mobo and control them manually? How can i do that? I tried the "SpeedFan" program but it's too confusing for me as i'm new to pc's.

2) I brought the cables outside from the case to plug the fans in when i'm gaming and plug them out when i'm not. I don't know if this is a good thing to do when the pc is still running.

Pls help!! :) The sound is too loud for me and my budget is little bit low to buy new fans :D Pls tell me what to do :) Thank you!
 
Solution


Yeah the controller supports 3 pins and as long as you have a spare drive bay it'll fit

Nicko_Bellic

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Jul 5, 2014
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All i have is 4 fans mate :) But the 2 of them are really loud (maybe is the time to even lower the noice of the rest).

Also, one quick question before i buy it online, i see that the only nzxt that is available in my country is the "nzxt sentry mix 2 fan controller". Is that product any good? Also, can i put it in my Thermaltake Commander Msi case ?
 


Yeah the controller supports 3 pins and as long as you have a spare drive bay it'll fit
 
Solution

Nicko_Bellic

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Jul 5, 2014
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Thank you mate, ordered it just a minute ago. I hope it does the job :)
 

Nicko_Bellic

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Jul 5, 2014
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Yeah mate, i know that if you plug a 3-pin fan in a 4-pin slot will work but the thing is that i want to control the 3-pin fans. I've already plugged the 3-pin fans in my 4-pin motherboard slots and they work fine but all i want to do is to lower their speed in light work and boost them to 100% when gaming. 4-pin fans uses PWM to control their speed so you have to control 3-pin fans by voltages, an i right?
 

badger700

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Feb 23, 2016
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Just for anyone still landing here; cheaper way if fans are available with molex connectors (pre-SATA power) is to swap the pin from 12v into the 5v supply. Doesn't shift a lot of air, but virtually silent.