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3 pin connector with 4 header [Parts in the description]

Hello! I have a problem! I'm currently building my first pc and I have run into a problem.

My pc case, VIVO ATX Mid Tower Economy Computer Gaming PC Case / Black Desktop Shell / 4 Fan Mounts, USB 3.0 Port (CASE-V01), has 2 case fans with 3 pin connectors. My motherboard, MSI ProSeries AMD Ryzen B350 DDR4 VR Ready HDMI USB 3 micro-ATX Motherboard (B350M PRO-VDH), has a 4 pin connector for the fans. I've read other threads addressing the same problem. I am aware that I can use adaptors to connect the fans to the headers but, I don't want them constantly running full speed. I don't wish for the unnecessary noise and dust from my PC. What should I do?
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  1. Best answer
    jmntox said:
    Hello! I have a problem! I'm currently building my first pc and I have run into a problem.

    My pc case, VIVO ATX Mid Tower Economy Computer Gaming PC Case / Black Desktop Shell / 4 Fan Mounts, USB 3.0 Port (CASE-V01), has 2 case fans with 3 pin connectors. My motherboard, MSI ProSeries AMD Ryzen B350 DDR4 VR Ready HDMI USB 3 micro-ATX Motherboard (B350M PRO-VDH), has a 4 pin connector for the fans. I've read other threads addressing the same problem. I am aware that I can use adaptors to connect the fans to the headers but, I don't want them constantly running full speed. I don't wish for the unnecessary noise and dust from my PC. What should I do?


    The two 4-pin headers of your motherboard, i.e., SYS_FAN1 and SYS_FAN2, are already in DC-mode by default (though you can still select in BIOS whether you want them in PWM-mode or DC-mode).

    Plug the 3-pin connectors to your motherboard's 4-pin headers like this:


    You're all set.

    Additional info:
    3-pin fans are DC fans which speeds can be controlled via a fan header (whether 3-pin or 4-pin) that is in DC-mode (where voltage supplied is variable, thus, allow the fans to change speed). When 3-pin fans are connected to a fan header in PWM-mode, the voltage supplied to such header is constant 12V (which will make the DC fans run in full speed). So, make sure the headers you plug the 3-pin fans into are set in DC-mode in your BIOS.
    Reply to raisonjohn
  2. The two 4-pin headers of your motherboard, i.e., SYS_FAN1 and SYS_FAN2, are already in DC-mode by default (though you can still select in BIOS whether you want them in PWM-mode or DC-mode).

    Plug the 3-pin connectors to your motherboard's 4-pin headers like this:


    You're all set.

    Additional info:
    3-pin fans are DC fans which speeds can be controlled via a fan header (whether 3-pin or 4-pin) that is in DC-mode (where voltage supplied is variable, thus, allow the fans to change speed). When 3-pin fans are connected to a fan header in PWM-mode, the voltage supplied to such header is constant 12V (which will make the DC fans run in full speed). So, make sure the headers you plug the 3-pin fans into are set in DC-mode in your BIOS.

    Thank you for answering my questions in such a quick notice!
    Reply to jmntox
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