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Thread: z77x-ud3h System Fans Query




  1. #11
    profJim's Avatar
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    Default Re: z77x-ud3h System Fans Query

    Aha!! You didn't mention any fans connected to the Cpu_Fan header.
    The problem appears to be when you mix 4-pin PWM fans and 3-pin fans on the Sys_Fan headers, where the 3-pin fan speeds can't be varied.

    You could try this:

    Move your current Cpu_Fan wires to one of the Sys_Fan headers.
    Note: You might find that each Sys_Fan header will give very different fan speeds when testing with the same fan.

    Connect the 3-pin fans to the Cpu_Fan header where you select Voltage to control these fan speeds.

    I think that I'm beginning to confuse myself.

    Let us know how this approach works out.

    You're welcome, glad to help out.
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  2. #12
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    Default Re: z77x-ud3h System Fans Query

    I can confirm only 2 fans get speed control. I have 2 3-pin fans connected (cpu fan and sys fan1 on the lower right side of board).

    They get controlled.

    Any other fans on the other headers just run full blast. Maybe there's some trick I don't know?

  3. #13
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    boondocks is offline Senior Member
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    Default Re: z77x-ud3h System Fans Query

    According the pin diagrams in the manual, fans 1-3 should work identically. Fan 4 looks like it would get full voltage all the time.
    YMMV.

  4. #14
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    Default Re: z77x-ud3h System Fans Query

    I have mounted a new pc for a friend of my with this MB Z77x UD3H. I have only the CPU Fan connected to the MB. What I will like to know is the setting to have this fan running at max speed all the time ( its a 4 pins PWM). Thanks
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  5. #15
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    Default Re: z77x-ud3h System Fans Query

    From page 47 in the mobo user manual:

    • CPU Fan Control mode

    Auto Lets the BIOS automatically detect the type of CPU fan installed and sets the optimal CPU
    fan control mode. (Default)
    Voltage Sets Voltage mode for a 3-pin CPU fan.
    PWM Sets PWM mode for a 4-pin CPU fan.
    Note: The Voltage mode can be set for a 3-pin CPU fan or a 4-pin CPU fan. However, for a 4-pin CPU
    fan that is not designed following Intel PWM fan specifications, selecting PWM mode may not effectively
    reduce the fan speed.

    • CPU Fan Speed Control

    Allows you to determine whether to enable the CPU fan speed control function and adjust the fan speed.
    Normal Allows the CPU fan to run at different speeds according to the CPU temperature. You can
    adjust the fan speed with EasyTune based on your system requirements. (Default)
    Silent Allows the CPU fan to run at slow speeds.
    Manual Allows you to control the CPU fan speed under the Slope PWM item.
    Disabled Allows the CPU fan to run at full speeds.

    • Slope PWM

    Allows you to control the CPU fan speed. This item is configurable only when CPU Fan Speed Control is
    set to Manual. Options are: 0.75 PWM value /oC ~ 2.50 PWM value /oC.
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    CyberPower CP1500PFCLCD UPS
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  6. #16
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    Default Re: z77x-ud3h System Fans Query

    As allways many thanks for your clear info ProfJim
    Last edited by ea3ot; 12-17-2012 at 12:12 AM.
    Asus PZ68-V Pro/Gen3
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    Phanteks tc-14 PE- 3 fans
    SSD OCZ VERTEX 4- 128 gb Win 10 x64
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    2x4GB Samsung 32nm 2133. 9-10-10-28 1T.VDRAM 1.55 - VCCIO 1.05
    PowerColor HD-7770
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    PSU. 750w Thermaltake
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    Samsung LPS 27" S27D850T
    https://www.facebook.com/media/set/?...4213100&type=3

  7. #17
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    Default Re: z77x-ud3h System Fans Query

    You're welcome, glad to help out.

  8. #18
    8bitg33k is offline Junior Member
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    Default Re: z77x-ud3h System Fans Query

    So the control option really only works when you are using either all 4pin PWM fans or 3pin fans. You cant mix a CPU PWM fan and say, 2x 3pin fans and have them all controlled by the BIOS. At least that's how I am understanding this.
    GA-Z77X-UD3H / i7-3770k / 2x4GB / Sapphire 7950 / OCZ Agility 3 60GB / 2x320 WD Blue / 850W Antec CP850

  9. #19
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    Default Re: z77x-ud3h System Fans Query

    I have both UD3H and UD5H and they both work same way, Cpu_fan can use both voltage control and PWM control, Sys_fan1 uses only voltage control and Sys_fan2 & Sys_fan3 headers use only PWM control. On UD3H I have 4 Gentle Typhoon AP-14's connected to Cpu_fan, 2 * Silverstone AP-181's connected to Sys_fan1 and an Akasa Apache connected to Sys_fan3, as you can see they are all running controlled even though I am using a mix of 3- and 4-pin fans

    z77x-ud3h System Fans Query-capture-png
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  10. #20
    8bitg33k is offline Junior Member
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    Default Re: z77x-ud3h System Fans Query

    Hm, that's good info but it doesn't seem to be working for me. Obviously I am missing something but I don't know what. Currently I have a 4pin PWM fan attached to the System_Fan 2 Header but it never ramps up or down but remains at a constant speed regardless of what setting I change in BIOS. The fan speed itself will change depending on which setting I choose but will remain at a constant speed on that setting. The CPU fan (also a 4pin PWM, attached to the CPU_Fan Header) ramps up and down depending on CPU temp, as it should.
    GA-Z77X-UD3H / i7-3770k / 2x4GB / Sapphire 7950 / OCZ Agility 3 60GB / 2x320 WD Blue / 850W Antec CP850

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