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PWM fan hub??

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chump7431
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2013/08/28 17:04:15 (permalink)
I am in the process of putting together a 900D build.

 
 
 I plan to have a 360 rad, 120 rad (360 and 120 for cpu), 480 rad, and a 240 rad (480 and 240 for gpus).  That means I will need 10 radiator fans alone.  I normally use a fan controller that mounts into the front bay, but I want to keep the front of the 900D nice and stealthy.  Is there any type of pwm fan hub that I can use to control my fans. 
 
 


 
 
 I have looked at the NXZT Grid, but that will run the fans at max and I really do not want to listen to that.  
 
What I would like to do is plug 10 fans into a powered hub and then have one connector that connects onto the motherboard so that I can control the fan speed through the bios.  Do they make anything like that?

BTW I am planning on using the Corsair SP 120 performance fans.  I have 5 in my current build and they seem to be just ok (motor noise on 2 of the fans(high pitch whine)), does anyone recommend anything better?
post edited by chump7431 - 2013/08/28 17:08:39

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    ty_ger07
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    Re:PWM fan hub?? 2013/08/28 17:35:54 (permalink)
    You don't need a fancy hub.  It is very simple to wire yourself.
     
    The fans get their "positive" and "negative" directly from the PSU.  The PWM input from the motherboard goes to all the fans.  And only one fan (important!) has the tachometer feedback back to the motherboard.
     
    Like this product image shows:


    http://www.rakuten.com/prod/rosewill-rcw-fps-401-splitter-cord-1-ft-molex-pwm-pwm-multi-colored/228743821.html
    http://www.newegg.com/Product/Product.aspx?Item=N82E16812119248R
     
    How to wire:
    Black ("negative") and yellow ("positive") to each fan from the PSU.
    Blue (PWM) to each fan from the motherboard fan header.
    Green (tachometer) back to the motherboard from only one (important!) fan.
     
    Here is a crude MS Paint sketch for only 2 fans.  Just add on more fans in the same way:

     
    PWM header connector to control fans (use the green and blue wires):

    http://www.frostytech.com/articleview.cfm?articleID=2608
     
    Do not hook the fan power up to the motherboard header or else you will overload the motherboard header.  Fan power needs to come directly from the PSU so they will all get full power and not overload the motherboard header.
     
    PSU Molex connector to power fans (use the black and yellow wires):

    http://retroblast.arcadecontrols.com/articles/coindoor.html
     
    The fan with the tachometer feedback to the motherboard is the master which will control all the other fans.  You can't connect more than one tachometer feedback to a header or else the signal will be corrupted.
     
     
    Your request is exactly the configuration I am using for my computer.  It is awesome!  So much better than having a fan controller to mess with.  I just set my CPU temperature target in my BIOS and my radiator fans ramp up and down together automatically as needed.  You could also connect the PWM wires and tachometer feedback to a video card fan header if you wanted to control the fan speed based on video card temperature.
     

    http://forums.evga.com/fb.ashx?m=928846

    As you can see, I have 6 PWM devices running off 1 motherboard header.
    post edited by ty_ger07 - 2013/08/28 18:19:40

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    chump7431
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    Re:PWM fan hub?? 2013/08/28 20:30:10 (permalink)
    I nominate Ty_ger07 for a BR!!!
     
    Wow great information!!! I really just wish they would do that in a hub.  It would make things much cleaner and easier.  So do you need to cut the ends on every fan?  Do the fans need to be PMW fans or can a standard 3 pin fan still work with that connector?  Nominate for a BR!!!

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    ty_ger07
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    Re:PWM fan hub?? 2013/08/28 20:46:09 (permalink)
    They need to be PWM fans to use the motherboard EDIT: ANY PWM header.  Otherwise, you need to create an intermediate circuit board between the header and the non-PWM fan to provide the PWM switching FET.
    post edited by ty_ger07 - 2013/08/28 21:04:57

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    Afterburner
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    Re:PWM fan hub?? 2013/08/28 20:46:54 (permalink)
    chump7431

    I nominate Ty_ger07 for a BR!!!

    Wow great information!!! I really just wish they would do that in a hub.  It would make things much cleaner and easier.  So do you need to cut the ends on every fan?  Do the fans need to be PMW fans or can a standard 3 pin fan still work with that connector?  Nominate for a BR!!!


    Done...

     
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    MexicanPlumber
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    Re:PWM fan hub?? 2013/08/28 21:07:21 (permalink)
    You could also use the NZXT fan hub and a Rheostat to control the power to the hub

    Heatware
     
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    ty_ger07
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    Re:PWM fan hub?? 2013/08/28 21:19:30 (permalink)
    MexicanPlumber

    You could also use the NZXT fan hub and a Rheostat to control the power to the hub

    That is very inefficient and not automatic.  PWM is much more efficient than using inline resistance as it does not create hardly any additional heat.

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    jimrun
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    Re:PWM fan hub?? 2013/08/29 06:24:16 (permalink)
    Fan Hub - PWM x 8 : http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=60_392&products_id=38757&zenid=7d0525ad1f1df6a2a1179cb28102b296 ...
     
    I always run all my fans at 100% via molex, & would assume this little item will eliminate allot of excess cabling in my rigs ...

      
      

     

      
      
     
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    ty_ger07
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    Re:PWM fan hub?? 2013/08/29 06:29:55 (permalink)
    jimrun

    Fan Hub - PWM x 8 : http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=60_392&products_id=38757&zenid=7d0525ad1f1df6a2a1179cb28102b296 ...


    That thing looks like it is missing a PWM input though to control the fan speed.  It looks like the fans will always run at 100% with that product.

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    jimrun
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    Re:PWM fan hub?? 2013/08/29 07:05:43 (permalink)
    ty_ger07

    jimrun

    Fan Hub - PWM x 8 : http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=60_392&products_id=38757&zenid=7d0525ad1f1df6a2a1179cb28102b296 ...


    That thing looks like it is missing a PWM input though to control the fan speed.  It looks like the fans will always run at 100% with that product.

    Yep; if you're concerned about varying the fan(s) speed - which I'm not - ^^ mine run at 100% 24/7 ...
    ... it should do a great job for my Cougar & Noctua fan set-ups (quiet to begin with) - both cases & rads ...
    ... the cooler the system runs, the better ---> at all times, imo ...  
     
    ... "to each his own" ...


      
      

     

      
      
     
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    ty_ger07
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    Re:PWM fan hub?? 2013/08/29 09:24:56 (permalink)
    The OP clearly wants to be able to control the fan speed automatically as he stated.  It makes little sense to have the fans running full blast when the system is idle and it is easy to avoid such a situation.

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    chump7431
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    Re:PWM fan hub?? 2013/08/29 19:26:44 (permalink)
    I think I found what I was looking for
    http://www.frozencpu.com/products/14982/cab-627/EK_4-Pin_PWM_4-Way_Splitter_Cable_-_Sleeved_Black_Black.html?tl=g30c637s1380&id=BnRv6LPg&mv_pc=9060

     
    ty_ger07, isnt this what you did, but the work is already done?

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    ty_ger07
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    Re:PWM fan hub?? 2013/08/30 05:37:41 (permalink)
    Yep, that should do the trick.

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    Re:PWM fan hub?? 2013/08/30 06:37:55 (permalink)
    Will this work with fans that only have three wires such as the Scythe Gentle Typhoon AP-15s?

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    ty_ger07
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    Re:PWM fan hub?? 2013/08/30 06:44:45 (permalink)
    3 wire fans do not have a PWM wire and lack the necessary PWM switching FET in the fan.  3 wire fans have a power wire, a ground wire, and a tachometer wire.  They will always run at 100% unless you adjust the power to the fan below 12v using an external modulator or rheostat (some sort of external fan controller).  You can not adjust the speed of a 3 wire fan using a standard 4 pin header.

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    Randolla
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    Re:PWM fan hub?? 2013/08/30 08:35:22 (permalink)
    ty_ger07

    3 wire fans do not have a PWM wire and lack the necessary PWM switching FET in the fan.  3 wire fans have a power wire, a ground wire, and a tachometer wire.  They will always run at 100% unless you adjust the power to the fan below 12v using an external modulator or rheostat (some sort of external fan controller).  You can not adjust the speed of a 3 wire fan using a standard 4 pin header.

     
    Thanks for that.  I am currently using the Corsair Link to control all of my fans.  It had been working OK but it was rife with problems in the past. Now it is not working again and I have to try to update the software and firmware and hope that it will work again.  Corsair has just announced that they will no longer support the cooling aspect of the Link so I am now stuck going forward. 
     
     I want to somehow automatically adjust my 4 AP-15s on my H100 as the temps go up and down on my CPU.  I don't mind getting new fans if need be but I think my H100 needs to be plugged into the motherboard to control the pump so I would have to use another header on my X58 FTW if possible to control the fans.
     
    Any advice would be appreciated.
     
    Thanks.



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