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Will this Y cable sync the speeds of both fans?

post #1 of 14
Thread Starter 
I'm thinking of using this for my Hyper 212+ push/pull setup. At the moment, they're running at different speeds since they are connected to different fan headers. Will the above Y cable work to set both fans at the same speed (and controlled by the mobo) when hooked up to the CPU fan header? I'm asking because the CPU fan header is 4-pin while this one is only 3-pin.
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post #2 of 14
there are 4pin pwm y cables available
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post #3 of 14
Quote:
Originally Posted by thehybridkiwi View Post

I'm thinking of using this for my Hyper 212+ push/pull setup. At the moment, they're running at different speeds since they are connected to different fan headers. Will the above Y cable work to set both fans at the same speed (and controlled by the mobo) when hooked up to the CPU fan header? I'm asking because the CPU fan header is 4-pin while this one is only 3-pin.


Are your fans 4-pin PWM fans?

And, you want both of them to be in speed sync by using the 4-pin PWM CPU header of your motherboard?

 

If yes to both questions, you need a 4-pin PWM cable such as this Gelid cable.

http://www.newegg.com/Product/Product.aspx?Item=N82E16812718001

 

 

post #4 of 14
that won't work, you need a four pin one. and look, both ends of the splitter you posted has 3 pins, it means both fans will gonna be sending rpm signal, that will mess up the readings.
post #5 of 14
Thread Starter 
http://bit.ly/zoospz

These should work as well right? And just to confirm, I'll need to make one of the connectors a 2pin to speed sync both fans (ie eliminate the tach signal)?
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post #6 of 14
Quote:
Originally Posted by thehybridkiwi View Post

http://bit.ly/zoospz
These should work as well right? And just to confirm, I'll need to make one of the connectors a 2pin to speed sync both fans (ie eliminate the tach signal)?

will work,
you need to eliminate one of the yellow wires, otherwise you might get wrong RPM reading
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post #7 of 14
Quote:
Originally Posted by thehybridkiwi View Post

http://bit.ly/zoospz
These should work as well right? And just to confirm, I'll need to make one of the connectors a 2pin to speed sync both fans (ie eliminate the tach signal)?


I suppose the 2 fans for your 212+ are both 4-pin PWM fans.

 

The cable (ie FC444PWM-12) above is by OKgear.  It is just a non sleeved version of FC444PWM-12BKS.

 

I have examined FC444PWM-12BKS and found that it contains all four pins for both fan connectors.  This is not a good design as rpm signals from both fans will be sent and will be confusing. 

 

This means, you can still get the above cable but you must physically remove one of the pins (ie the fan speed signal pin) from one of the fan connector.

 

Read the thread below and note my post #3 for a more detailed explanation with pictures.

http://www.overclock.net/t/1052003/pwm-splitters

 

Alternatively, if you are not comfortable with removing a pin or cutting a cable, just get the Gelid cable for $3 more.

post #8 of 14
Thread Starter 
Quote:
Originally Posted by IOSEFINI View Post

will work, you need to eliminate one of the yellow wires, otherwise you might get wrong RPM reading

I was reading some reviews on the OKGear cable where the wire colours may not correspond correctly to convention... is there another way to tell which pin is the tach signal?
Quote:
Originally Posted by windfire View Post

I suppose the 2 fans for your 212+ are both 4-pin PWM fans.

Thanks for the info. One of the fans is actually 3-pin (Rosewill RFA-120-K). I noticed in your pictures that the middle pin was eliminated. Will this impact the connection with the 3-pin fan?
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post #9 of 14



 

Quote:
Originally Posted by thehybridkiwi View Post

http://bit.ly/zoospz

These should work as well right? And just to confirm, I'll need to make one of the connectors a 2pin to speed sync both fans (ie eliminate the tach signal)?


Just get one of this and you don't have to worry about overloading the CPU fan header.

 

http://www.frozencpu.com/products/10350/cab-183/Akasa_PWM_Splitter_-_Smart_Fan_Cable_AK-CB002.html#blank

 

 

cab-183.jpg

 

 

Actually this one works fine without further modification. The tach for RPM feedback is for one fan only.

 

http://www.newegg.com/Product/Product.aspx?Item=N82E16812718001&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=4003003&SID=1q1j2007m4kib

 

Capture.JPG

Blue = PWM

Green = Tach (RPM) feedback

Yellow = +12V

Black = Ground 

 

 

Capture.JPG

 


Edited by Ken1649 - 2/14/12 at 7:21am
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post #10 of 14
Thread Starter 
Can I still use the Gelid's if one of my fans is a 3-pin? I'm asking because one of the middles pins is missing as supposed to an edge pin - that means my 3-pin fan will only be connected via two pins.
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