Question about ASUS MB M3A78-EMH HDMI RT Motherboard

2 Answers

Extra wire /fan 3pin hole 1wire where to plug in X 2 fans

Asus M3A78EM,M.B. fans for cpu cooling have each got extra yellow wire,where do I conect to M.B. Can't find pins.I hope someone isa smarter than me ouitr there,an d can I hook up 2 fans to same hookup, or is therew 2cnections or do I need an adapter.If it;sspeeded up or sloweddown by voltage is it posible to connect both wires to same hookup.Trying to solve any mixups beforhand

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  • dave21812 Feb 14, 2009

    The fan has a 4pin conector that goes to the power unit. the large type still being used on H.D. and dvd units ,cd units,but the wire I'm talking about is a seperate 5th wire tha only uses 1 of the three holes. Holding the white plug down flat with the 2 guides up ,as it will only go on one way ,it's the left side.Now the cpu socket has a four pin receptacle.My plg will fit on as the peice that goes between the two guides on the M.B. is ofside and the man. labels that pin cpu fan in. Is that pin a,the sensor pin.Hate to blow M.B. by a simple mistake.I only do knowingly.No guess.

  • dave21812 Feb 14, 2009

    The receptacle on M.B. is for cpu labeled as such left to right cpu fan pwm,cpu fan in,cpu fan power,gnd.My 3 pin connector with one wire fits on 2nd,3rd,4th.and the only wire to that conector contacts,cpu fan in .fit's perfectly as I said guide is offset. My apologies to everyone who tried to help,for my ununderstandable discription. I think I solved it my6self but would like absoulute info.Again ,blow M.B. for something so simple. I would advise everyone to be as safe as I am.You learn by your mistakes,but rather it be a mental mistake.Know,Not think you know.affirmation please. dave21

  • dave21812 Feb 15, 2009

    I am using an after market heat sink.It uses2 120mmfans.They use the old style large 4 prong connectors tha come from the power supply.The M.B. has a 4 prong setup .A 5th wire attached to a 3 prong plug.It fits offcenter on the 4prong setup .The M.B. doesn't tell you which prong is for the sensor. There is a small 4 prong receptacle on the M.B.When you plug the fan's to the large connectors from the power unit it's cofusing about what to do with 5th wiremounted on a small 3 pron plug and the manual doesn't tell that you plag the 3 prong on the 4prong and that it will fit beacause of the offset sytem the wire receptacle in place.but it's a perfect fiit. Is the cpu fan in prong for the sensor.Asus does'nt isn't clear about what prong is for what .Can someone tell me if I'm right.dave21

  • dave21812 Feb 15, 2009

    I am using an after market heat sink.It uses2 120mmfans.They use the old style large 4 prong connectors tha come from the power supply.The M.B. has a 4 prong setup .A 5th wire attached to a 3 prong plug.It fits offcenter on the 4prong setup .The M.B. doesn't tell you which prong is for the sensor. There is a small 4 prong receptacle on the M.B.When you plug the fan's to the large connectors from the power unit it's cofusing about what to do with 5th wiremounted on a small 3 pron plug and the manual doesn't tell that you plag the 3 prong on the 4prong and that it will fit beacause of the offset sytem the wire receptacle in place.but it's a perfect fiit. Is the cpu fan in prong for the sensor.Asus does'nt isn't clear about what prong is for what .Can someone tell me if I'm right.dave21

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Dave,

Your motherboard has a 4 pin connector for the CPU fan AND a 3 pin chassis fan connector.

Do you have the manual for the motherboard?

On page 1-8 the MB layout shows a 4-pin CPU connector about 1/2 inch behind the ethernet/lan connector. It should be screened on the MB as CPU_FAN.

The connector for the chassis fan is in the upper right of the board, just above and to the right of the RAM slot furthest to the right. It should be screened CHA_FAN on the MB.

If you do not have a manual, comment back and I can lead you there on the Asus support site.

Good luck and thanks for using Fixya.

Posted on Feb 14, 2009

  • Wayne Mineard
    Wayne Mineard Feb 15, 2009

    I am confused why you would rate this as Inapproprite. You asked if you could connect 2 fans and where the pins were. I told you. I know the pinouts. They are on page 1-11 of the manual. I have the layout of your MB.



    Sorry, but your Inappropriate rating is Inappropriate IMO.



    Have a nice day, nonetheless.



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  • Master
  • 1,179 Answers

If your cpu fan has a 4 pin connector & your mb has a 3 pin you can still use it. Just leave one pin exposed. The extra pin is for a speed control sensor that not all mb's support. The chassis fan has a different connector on the board marked "cha fan". This one is a 3 pin connector. Most of the asus boards have 1 of these. If you wish to run more than one you can either buy a "y" adapter that allows you to connect 2 fans to 1, you could use an extra 4 pin molex to power an extra fan but that would give you no control over the fan, or you could buy a fan controller and hook all your extra fans to it. Hope this helps & please take a moment to rate my solution fixya. Thanks.

Posted on Feb 14, 2009

  • Roy Lonsinger
    Roy Lonsinger Feb 15, 2009

    Do you actually think I would still help after you gave a terrible rating for the correct answer to your original problem? I'm done.

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