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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! :)

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!
14 answers Last reply Best Answer
More about manually control speed pin case fans plugged pin slot pls
  1. 1. No you can't control the speeds, you can only control the speeds of 4 pin fans

    2. That is quite dangerous to do

    You can get the nzxt sentry mesh, it's a fan controller for 3 pin fans
  2. yes you can

    the 3rd pin is volatge control for speed, the 4th is pwm for speed.

    4pin - http://www.allpinouts.org/index.php/Motherboard_(CPU)_4_Pin_Fan
    3pin - http://www.allpinouts.org/index.php/Motherboard_(CPU)_3_Pin_Fan_Connector

    note that the 4 pin = 3 pin + 1 extra pin, therefore a 4 pin can be used like a 3 pin.
  3. So you are telling me that i can only control the 3 pin fans if i buy a device like nzxt sentry? So there is no program for 3-pin fans?
  4. Nicko_Bellic said:
    So you are telling me that i can only control the 3 pin fans if i buy a device like nzxt sentry? So there is no program for 3-pin fans?


    Not in your motehrboard no
  5. Nicko_Bellic said:
    So you are telling me that i can only control the 3 pin fans if i buy a device like nzxt sentry? So there is no program for 3-pin fans?


    don't bother reading any other answers then...
  6. Meh... I have to buy NZXT Sentry then... I hope it is good and do the job... Thanks guys! :)
  7. Nicko_Bellic said:
    Meh... I have to buy NZXT Sentry then... I hope it is good and do the job... Thanks guys! :)


    I can only control up to 4 fans though , bear that in mind
  8. 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 ?
  9. Best answer
    Nicko_Bellic said:
    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
  10. legend001523 said:
    Nicko_Bellic said:
    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


    Thank you mate, ordered it just a minute ago. I hope it does the job :)
  11. YOU DO NOT NEED A FAN CONTROLLER TO DRIVE 3 PIN FANS FROM A 4 PIN HEADER. A 4 PIN HEADER IS A 3 PIN HEADER WITH AN EXTRA PIN.
  12. 13thmonkey said:
    YOU DO NOT NEED A FAN CONTROLLER TO DRIVE 3 PIN FANS FROM A 4 PIN HEADER. A 4 PIN HEADER IS A 3 PIN HEADER WITH AN EXTRA PIN.


    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?
  13. you can control them, either through mobo or through speedfan (if mobo is supported).
  14. 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.
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