Confused on connected ATX motherboard to PSU

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budgy

budgy

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Sep 20, 2013
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Hi guys,

I bought a new Rosewill Capstone 450w modular PSU and I'm trying to connect it to my old ATX motherboard. I am confused:

The motherboard has a sticker on the ATX12V that says "For 8 Pin 12V Power Connector". But on my old PSU, the plug was only a 4-pin; it connect to half of the insert. According to owners manual, the new PSU comes with 1 ATX12V 20+4 pin(What is this?) and 1 EPS 12V 8-pin. But the PSU came with three 4-pin cube shaped connectors. What am I suppose to insert to the motherboard? I'm confused. Thanks!!
 
Solution
C
Most newer motherboards use a 24-pin connector for the main power connection. For compatibility reasons, the 24-pin connector is provided as a 20+4 pin plug on the power supply. On an older motherboard, the 4-pin part of the connector is not connected.

As for the EPS 12V connector, this is usually provided by 2 4-pin cube shaped connectors, again for compatibility reasons. Are 2 of the 4-pin connectors very close together?

Casey
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cklaubur

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Oct 4, 2006
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Most newer motherboards use a 24-pin connector for the main power connection. For compatibility reasons, the 24-pin connector is provided as a 20+4 pin plug on the power supply. On an older motherboard, the 4-pin part of the connector is not connected.

As for the EPS 12V connector, this is usually provided by 2 4-pin cube shaped connectors, again for compatibility reasons. Are 2 of the 4-pin connectors very close together?

Casey
 
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budgy

budgy

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Sep 20, 2013
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Thanks for the reply. The PSU is semi-modular. There are 4 plugs total coming out of the PSU. One tube has 2 connectors, the main power connector (long one, I am assuming it is the ATX 12V 20+4 pin, which is already plugged it; and a 4-pin cube shaped connector. The other tube has 2 4-pin cube shaped connector and labeled "CPU1". One 4-pin says "CP", the other says "U1" Here is the picture of my motherboard. Click on the 3rd picture and look at the bottom left. You can see a pink sticker on a plug. If I can remember correctly, is that one to power the CPU?

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157176

Here is the picture of one tube with 2 4-pin connectors:

http://www.allpinouts.org/images/1/1f/Connector_mbpow_eps_12v_2x4pin.png

Here is what the other tube looks like, top left:

http://lib.store.yahoo.net/lib/directron/ps650u1204.jpg

Another question: What will happen if I only plug in the 20-pin adapter and not the other 4-pin? Are the extra pins for extra power?


Edit: Ok, I am reading that 20-pin is normal...and if you are OC'ing, you need the extra 4-pin. This is the same with the other 2 4-pin CPU connectors: 1 is normal, the other one is for extra CPU power.. Is this correct?



 
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cklaubur

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If your motherboard has the connections for it, I'd go ahead and plug them in. It won't hurt the computer, and if you decide to upgrade (to a better processor, for example) you don't have to mess with them.

The two 4-pin connectors labeled "CPU1" are your EPS12V connector. The computer should run just fine, especially if you are using a low-power processor, on just one 4-pin connector, but the way I see it, the socket is on the motherboard and the plug exists on the PSU, so you might as well hook it up. The computer will only use as much power as it needs, so you won't stress anything as long as the PSU is strong enough to run your computer.

Casey
 
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