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Thread: Z77X-UD5H : System fan headers - curious behavior




  1. #51
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Anyone successfully running two fans off the cpu header and if so what is your setup? I had two 120mm enermax ucma12 units(not pwm) in push pull on a H60 with voltage control mode and worked perfectly but then right I away started getting usb power surge warnings in Win7. Switched back to one fan per header(either both 100% or uneven RPM) and the usb warnings were gone...the fans are rated at 0.35amps each so still under the 1amp rating for the header. I've got the latest (non-beta) drivers for everything as of today. Don't mind 100% with these fans but loved how quiet it was when idle....may give up the push pull but this is supposed to be an overclockers board...

  2. #52
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Did you use a Y-type of cable splitter to connect both fans to the same header?
    If yes, only one yellow sense wire from one fan should be connected to the fan header.
    The yellow wire is used to report fan speeds and with both yellow wires connected to the a single fan header this might have caused the problem.
    The usb warning might not occur with only one fan's yellow sense wire connected to the mobo fan header.
    Using a fan controller to simultaneously control both fans might be the best way to go.
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  3. #53
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Yes, i have the correct Y-type cable, as you described, only one side has the third(yellow) RPM sensor line, the other only red and black being ground and power. Weird on the USB issue, i read that alot of people were having this issue with the board, i wonder if something was wired poorly... I could do a manual fan controller but don't trust the kids/wife to adjust when it's getting hot and i've left it overclocked @ 4.5K, but honestly in a push pull setup with these 18dBA fans at 100% flow the sound isn't too bad and the cpu is very very cool(25C doing basic internet stuff). Was thinking of one high flow delta PWM fan instead hoping the noise will be somewhat bearable when pushing it.

  4. #54
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Other forum members have posted that Gigabyte tech support replied to the maximum safe amperage question for each header where tech support said that 1 amp maximum per fan header was OK.
    The last time I checked, high CFM Delta fans (100 - 250 CFM models) were extremely loud and some fans required ~3 - 5 amps per fan!!
    It wouldn't be very hard to install a SPDT or DPDT switch with no center off position that would switch between full 12v volts or allow a fan controller to control both fans. Just don't tell them about the switch.
    I can provide a wiring diagram to show the connections if you want.

    Note: Page 27 in your mobo user manual shows that there are five 4-pin fan headers:
    • CPU_FAN
    • SYS_FAN1, SYS_FAN2
    • SYS_FAN3, SYS_FAN4
    If you look at the diagrams you'll see that the pin #4 description for Sys_Fan1 and Sys_Fan4 are different from the others.
    Using a different fan header for each fan, you might be able to let the voltage control option in the bios control each fan with similar speeds if you test all header combinations.
    Most older Gigabyte mobos have a built-in design where Sys_Fan2 would normally power a fan at approximately 50% of rated fan speed.
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  5. #55
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Before I went to water cooling I was running the Noctua NH-D14 cpu cooler (2 fans) off the cpu header with no problems.

    I don't think the USB issues are related to this as these issues have been widespread with earlier USB drivers. Gigabyte recently updated the USB 3.0 driver on their download page to 1.0.4.225. Early on I had a few warnings from Windows about the USB but since updating drivers weeks ago no problems at all. I'm using the front panel USB 3.0 header that came with the board plugged into the 1st Intel header and it works fine in and out of the BIOS.

  6. #56
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Ignore boondocks' suggestion, it's a solution that is way to simple and easy
    J/K

  7. #57
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    That's me - simple and easy!

  8. #58
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    That's me - simple and easy!

  9. #59
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    I had updated the usb drivers from intel and then installed the ones off the gigabyte driver page when troubleshooting, but i don't remember which versions they were, i'll review that again. Always possible my Y splitter is bad however unlikely. I do think eventually this will be addressed in a driver/bios update so i won't sweat it. Good to hear someone else got a dual fans working so not a chronic systematic problem with the board.

  10. #60
    Ken429 is offline Senior Member
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    For what it's worth, I have two Blade Master 120 PWM fans running in a Push/Pull configuration connected to the CPU Fan Header and everything works as it should. I have the H60 pump connected to the Case Fan 4 Header. I have tried other case fan headers for the Pump and do not see a difference, the pump runs at full speed?! I also tried using the BIOS to control the Case Fan Headers and do not get much action - speed variation that is. Although, the CPU header set to PWM, Manual and a slope of 2.00 does the job nicely. In fact, I went and bought two Cougar Vortex PWM fans to see if they run quieter when the system is under 100% load.

    Also, I am using the latest and greatest BIOS, Drivers, Utilities, etc. posted on the Gigabyte site.
    Last edited by Ken429; 06-05-2012 at 10:39 PM.

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