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4pin molex connector on atx power supply and mobos ?

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May 14, 2009 5:06:37 AM

Hello :hello: 


Most ATX power supply for p4, athlons and such have a 4pin square connector called 4pin molex for p4, or so ive read. to give an idea of what connector im talking about i put this pic here

http://www.helpwithpcs.com/courses/power-supply/12v-pow...

or at this motherboard pic (its to the right of the 24pin molex mobo connector)
http://www.abit.com.tw/upload/products/NF7-S_pic6.jpg





Question is, , i have it currently unpluged.. what exactly does this molex connector do? just wanna know if ill have any problems if i dont plug it... and ive found very little information on the internet about it




(Abit NF7 v 2.0 mobo with an Athlon XP 2400 cpu)


Thanks :bounce: 

a b V Motherboard
May 14, 2009 5:56:00 AM

It's called an ATX12V connector and it's supposed to power the CPU voltage regulator. Your system isn't supposed to run without it.
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May 14, 2009 4:14:17 PM

I see, since i dont know what a cpu voltage regulator's is
I'll rephrase my question.


Will my system fail or will i have fried cpu (or mobo) if i don't plug this? or is there any other thing that is likely to fail? maybe the power supply itself?

This PC has been running 24/7 for months (like 3 months give or take) without plugging this connector..
Running demanding games and such.

(I'm using this power supply that doesn't have that connector) And I was thinking on moving this power supply to another similar system (an amd sempron64, i repeat, currently its running on an Amd AthlonXp w/o problems so far)



Thanks for your help
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a b V Motherboard
May 14, 2009 4:31:52 PM

batman1978 said:
I see, since i dont know what a cpu voltage regulator's is
I'll rephrase my question.


Will my system fail or will i have fried cpu (or mobo) if i don't plug this? or is there any other thing that is likely to fail? maybe the power supply itself?

This PC has been running 24/7 for months (like 3 months give or take) without plugging this connector..
Running demanding games and such.

(I'm using this power supply that doesn't have that connector) And I was thinking on moving this power supply to another similar system (an amd sempron64, i repeat, currently its running on an Amd AthlonXp w/o problems so far)



Thanks for your help


It shouldn't hurt anything, I'm just suprised it runs. The CPU voltage regulator is what POWERS the CPU.
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February 19, 2010 6:36:58 PM

I had the same question and found the answer here.

I believe the 4-pin molex connector is the auxiliary power connector, and if the original poster replaced the power supply with a new 24-pin connector (instead of the old 20-pin one), then you shouldn't need the square, 4-pin molex.
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a b V Motherboard
February 19, 2010 6:54:37 PM

nmliz said:
I had the same question and found the answer here.

I believe the 4-pin molex connector is the auxiliary power connector, and if the original poster replaced the power supply with a new 24-pin connector (instead of the old 20-pin one), then you shouldn't need the square, 4-pin molex.


No, the 24-pin connector was adopted to add more power pins for PCI-Express, as was the flat 4-pin auxiliary power connector. The square 4-pin CPU power connector is supposed to be on a completely different circuit (and the 8-pin version is just a higher-amperage version of the 4-pin square power connection).
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March 9, 2010 9:17:41 PM

my mother board does not need the atx 4pin but my psu has a 20+4. Can I take the atx 4 pin and use it for something else? I have been looking for a converter or adaptor to make it in to a molex so I can use it. Any thoughts? I would like to use it to power my fan controller witch will have 4 fans plugged in to it.
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November 11, 2013 6:37:00 AM

In my case, the fans run but the CPU doesn't which makes me think that power is required at the four pin socket. I am considering identifying the + and - of the socket and feeding in from the black and yellow 12v circuit.
Wyoham
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