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




  1. #11
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Don't you have 2 CPU fan headers on that z77? For push/pull
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  2. #12
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Quote Originally Posted by wazza300 View Post
    Don't you have 2 CPU fan headers on that z77? For push/pull
    Nope. 1 cpu fan, 3 fans controlled from BIOS, 1 fan header that apparently runs full volts. Got inside fan on cpu fan, outside fan on Sys_Fan2, pump on Sys_Fan3. (hmmmmm. I may swap this) Unlike previous boards the Sys_Fan2 does not run at half voltage.
    Maybe one of you gurus can tell me how to wire the 2 vortex fans so they both run same speed on different headers so I don't blow a header like I did on the Z68. Both are COUGAR CF-V12HP Vortex pwm.
    Anyway ran IBT Very High last night and highest temp was 60 I think which is around 14 degrees better than it was.
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  3. #13
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    You should be able to safely run with two fans on one fan header up to 3 amps (36 watts) and possibly higher.
    On my P35-DS3L system, I ran a push/pull setup with 2 Xigmatek 80 CFM fans with no problems.

    You can buy Newegg.com - OKGEAR Model FC444PWM-12 12" 4pin PWM fan Y cable, where you would need to disconnect one of the YELLOW wires from one male connector on this 4-pin fan cable splitter.

    **edit**
    Correction made for disconnecting one of the YELLOW wires.
    More information is in Z77X-UD5H : System fan headers - curious behavior, post #31 in this thread.
    Last edited by profJim; 04-23-2012 at 08:03 PM. Reason: correction: cable has 2 MALE connectors and disconnect one YELLOW wire
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Quote Originally Posted by profJim View Post
    You should be able to safely run with two fans on one fan header up to 3 amps (36 watts) and possibly higher.
    On my P35-DS3L system, I ran a push/pull setup with 2 Xigmatek 80 CFM fans with no problems.

    You can buy Newegg.com - OKGEAR Model FC444PWM-12 12" 4pin PWM fan Y cable, where you would need to disconnect one of the green wires from one female connector on this 4-pin fan cable splitter.
    I have a 4 wire splitter here somewhere, or should. Might be the same one, I'll look.
    Are you certain of that 3A capability on the fan headers?
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  5. #15
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Are you certain of that 3A capability on the fan headers?
    Absatively posalutly!!
    Lsdme posted this information several years ago and was confident that it applies to newer boards.
    I don't know if he confirmed the maximum safe amp/wattage capacity with newer boards, including all UDx and later models.
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  6. #16
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    if your in doubt id buy a cheap fan controller,it least you can set the speed yourself then, and you dont need to mess with mb headers ect,i find the cheap ones to work well,i think its a bit of a shame gigabyte dont put two pwm cpu fan headers on their mb's like asus do on their z68 boards,with modern heatsinks requiring two fans nowadays i think its a must
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  7. #17
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Quote Originally Posted by profJim View Post
    Absatively posalutly!!
    Lsdme posted this information several years ago and was confident that it applies to newer boards.
    I don't know if he confirmed the maximum safe amp/wattage capacity with newer boards, including all UDx and later models.
    I would be surprised if these vortex fans draw very much, I wouldn't think at absolute max over .5A and that's probably a stretch.
    Quote Originally Posted by wazza300 View Post
    if your in doubt id buy a cheap fan controller,it least you can set the speed yourself then, and you dont need to mess with mb headers ect,i find the cheap ones to work well,i think its a bit of a shame gigabyte dont put two pwm cpu fan headers on their mb's like asus do on their z68 boards,with modern heatsinks requiring two fans nowadays i think its a must
    Well I might get a controller at some point. I keep looking at them from time to time trying to figure out what the differentiating features are. Guess in basic form most are simply rheostats, although some have pwm for 1 fan and some have temp probes which might be ok, but don't seem all that practical.

    Another thing I keep trying to get a handle on is the pwm settings for the fans. pwm/slope etc I don't know what these settings mean other than the highest numerical settings (2.75?) seem to offer more idle rpms. On this board the cpu fan of course and 3 of the system fans have the option to use this, and like I say the 4th fan evidently gets full volts all the time.
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  8. #18
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Quote Originally Posted by profJim View Post
    You can buy Newegg.com - OKGEAR Model FC444PWM-12 12" 4pin PWM fan Y cable, where you would need to disconnect one of the green wires from one female connector on this 4-pin fan cable splitter.
    Ok all I have is a 4 wire Y connector. It's just 4 wire female to 2 4 wire male connectors. What do I need to disconnect? One of the male green wires?

    EDIT: I was wrong, 2 green wires. Got it.
    Last edited by boondocks; 04-22-2012 at 11:46 PM.
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  9. #19
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Correction made in post #13, I got the male/female connectors bass ackwards in the post.
    Yes, you should disconnect a yellow wire that goes to one of the male connectors.

    **edit**
    correction: the yellow wire is the rpm sense wire for reporting fan speed.
    With a y-type cable splitter, you only want one yellow wire from one fan connected to the fan header.
    With two yellow wires (one for each fan) going to the fan header, you will probably have inaccurate reported fan speeds.
    Last edited by profJim; 04-26-2012 at 08:35 AM. Reason: correction
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  10. #20
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    Default Re: Z77X-UD5H : System fan headers - curious behavior

    Quote Originally Posted by profJim View Post
    Absatively posalutly!!
    Lsdme posted this information several years ago and was confident that it applies to newer boards.
    I don't know if he confirmed the maximum safe amp/wattage capacity with newer boards, including all UDx and later models.
    Yessir!

    3 Amps @ 12V per header
    http://forums.tweaktown.com/gigabyte...tml#post318451

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