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




  1. #31
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Quote Originally Posted by boondocks View Post
    OK I was wrong. I did clip all but the voltage wires from one leg of the Y connected to the female.
    So I should clip a green wire only from one of the males, correct?
    NO!!!

    Sorry, my original post should have said to disconnect one of the YELLOW wires going to one of the cable's male connectors.
    Each GREEN wire is the PWM control wire so each fan must have a green wire connection.
    The yellow wire is the SENSE wire that reports the fan's speed.
    Red is the 12 volt (+) wire.
    Black is the ground (or earth) wire.
    With only the red and black wires connected from the fan header to a fan, it will always run at full speed.

    Check out http://forums.tweaktown.com/gigabyte...tml#post418608 for a diagram of a custom cable setup where each fan's speed will reported using two fan headers.

    Motherboard (CPU) 3 Pin Fan Connector Connector Pinout - AllPinouts
    shows the pin-out setup for a 3-pin connectors.
    Wire colors with a 4-pin connector can vary somewhat with some splitter cables.
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  2. #32
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Quote Originally Posted by profJim View Post
    NO!!!

    Sorry, my original post should have said to disconnect one of the YELLOW wires going to one of the cable's male connectors.
    Each GREEN wire is the PWM control wire so each fan must have a green wire connection.
    The yellow wire is the SENSE wire that reports the fan's speed.
    Red is the 12 volt (+) wire.
    Black is the ground (or earth) wire.
    With only the red and black wires connected from the fan header to a fan, it will always run at full speed.

    Check out http://forums.tweaktown.com/gigabyte...tml#post418608 for a diagram of a custom cable setup where each fan's speed will reported using two fan headers.

    Motherboard (CPU) 3 Pin Fan Connector Connector Pinout - AllPinouts
    shows the pin-out setup for a 3-pin connectors.
    Wire colors with a 4-pin connector can vary somewhat with some splitter cables.
    So the final tally is: Disconnect yellow wire from one leg of the Y (male). Correct?
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  3. #33
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Yes when connecting 2 fans together you only need 1 yellow wire connected to 1 of the fans.
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  4. #34
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Having both YELLOW sense wires connected with two fans will probably cause incorrect reported fan speeds when you're using only one fan header.
    Darkje's wiring diagram uses one YELLOW wire for each fan connected to 2 different fan headers and this setup will report the speed of each fan independently.

    Sorry for the confusion with my previous post that has now been corrected.
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  5. #35
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Thanks, guys, no problem. I reconnected the extra wire I cut and everything seems to be in sync again, i.e. both fans reporting as one, and I assume they are ramping up/down together. -boy these wires are tiny-
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  6. #36
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Here is the reply from Gigabyte about the current available on the fan headers on my Z77 board:
    "Each header is rated up to 1A
    It would not be advise to use 2 fan onto 1 header"

    I'm back to using the NH-D12 with both fans which are Y'd into the cpu fan header. I've never had any problems with it before so I'm not going to worry about it. I'm still under .70 amp draw.
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  7. #37
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    English manual page 27 says:

    CPU FAN:
    Pin2 +12V/Speed
    Pin4 Speed

    FAN1:
    Pin2 +12V/Speed
    Pin4 VCC

    FAN2/FAN3
    Pin2 +12V
    Pin4 Speed

    FAN4
    Pin2 +12V
    Pin4 Reserve

    So the FAN4 don't support speed control at all.

  8. #38
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Probably not, it looks like the Fan_4 header will probably always run it's fan at full speed.
    With pin 4 = reserve, it might be able to control it's fan speed in the future with a bios "enhancement."

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  9. #39
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Quote Originally Posted by s4e8 View Post
    English manual page 27 says:

    CPU FAN:
    Pin2 +12V/Speed
    Pin4 Speed

    FAN1:
    Pin2 +12V/Speed
    Pin4 VCC

    FAN2/FAN3
    Pin2 +12V
    Pin4 Speed

    FAN4
    Pin2 +12V
    Pin4 Reserve

    So the FAN4 don't support speed control at all.
    Nope, it's wide open all the time. I use it for a 200mm fan.
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  10. #40
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    I was seriously thinking about getting this fan controller:Newegg.com - 1ST PC CORP. FC-FC2-B Lamptron 5.25" 6-channel fan controller, 45w/channel, 3-pin fan & molex power co
    Would be real handy instead of having to go into BIOS and set all fan controls to disabled when I want to so stress testing.

    Pros/Cons? Could this be setup to monitor fan speed? I normally use hwinfo64 for monitoring which of course uses mobo readout.
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