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8-pin CPU connector from power supply seemingly doesn't match with corresponding 8-pin connector on motherboard

Last response: in Motherboards
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July 14, 2013 9:53:04 PM

Just a heads up in case anyone runs into the same issue I did.

I am running this power supply:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

With this motherboard:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The 12V CPU connector coming from the power supply looks like this:

http://www.techpowerup.com/reviews/Tagan/SuperRock_680W...

The corresponding connector on the motherboard looks like this:

http://i.stack.imgur.com/OZrET.jpg

On the power supply connector, notice none of the right 4 pins are square shaped. However, on the corresponding motherboard connector, two are square shaped. I initially thought this was a mismatch and proceeded to plug only the left 4 pins in the motherboard. Then I noticed the computer kept randomly rebooting when playing a video. After hours of diagnosis work, I narrowed it down to a power problem and plugged in the additional 4 pins. Random reboot problem GONE!

This is a very tricky and misleading problem because I am used to plugs and connectors matching exactly. I'm curious if anyone has experienced the same issue.
a b ) Power supply
a b V Motherboard
a b à CPUs
July 15, 2013 6:56:14 AM

the 8 pin for the GPUs and the 8pins for the CPU look very much alike. if it doesnt fit, it isnt supposed to be there.

July 15, 2013 11:50:39 AM

TheBigTroll said:
the 8 pin for the GPUs and the 8pins for the CPU look very much alike. if it doesnt fit, it isnt supposed to be there.



The CPU connector coming from the power supply is clearly labeled. See this photo taken from Newegg's product page (it's an Antec EarthWatts EA-380D):

http://farm8.staticflickr.com/7310/9295473010_f6a9c06a4...

I say it's misleading because the rounded pins fit in the square pins on the motherboard connector. So it seems like it isn't a match but it is. It looks like the connector is designed this way for backward compatibility:

http://forums.hexus.net/help-quick-relief-tech-headache...
Related resources
a b ) Power supply
a b V Motherboard
a b à CPUs
July 15, 2013 12:06:14 PM

the 4+4 pin will plug into the CPU 8 pin. it was split in half due to how mobos used to use a single 4 pin but since some of them needed more power, they made it so that its a 4+4

it will only fit one way. pretty sure people can figure it out by themselves
a b ) Power supply
a b V Motherboard
a b à CPUs
July 15, 2013 12:57:47 PM

On the spec it says 1 x 4+4 Pin ATX/EPS 12V

4+4 pins = 8 pins
July 16, 2013 11:31:14 AM

TheBigTroll said:
the 4+4 pin will plug into the CPU 8 pin. it was split in half due to how mobos used to use a single 4 pin but since some of them needed more power, they made it so that its a 4+4

it will only fit one way. pretty sure people can figure it out by themselves


So you'd blindly plug in semi-rounded pins into square pins? No, it's not obvious.
July 16, 2013 11:43:46 AM

beanoslim said:
On the spec it says 1 x 4+4 Pin ATX/EPS 12V

4+4 pins = 8 pins


I am aware of that. The issue is the semi-rounded pins coming from the 12V CPU power supply connector plugging into the square pins on the motherboard connector.
a b ) Power supply
a b V Motherboard
a b à CPUs
July 18, 2013 10:43:05 AM

Sorry I didn't get your 1st gripe, you are saying that the wrong connector fits into a different slot.

I guess that is a problem as the whole idea is as mentioned if it doesn't fit it shouldn't be there.

I don't ever remember coming across this problem before, usually it becomes obvious after the 1st failed attempt.

December 8, 2013 5:04:20 PM

i am getting fps lag just with 1 4 pin connect because my psu only has 1 4 pin and my mobo has a 8pin so ill have to buy a cable to change it to a 8pin ?
a b ) Power supply
a b V Motherboard
a b à CPUs
December 8, 2013 5:36:14 PM

If someone do have PSU like this. There is no label on any cable.


And I think there is a 4 pin + 8 pin connector.

But then it do have only 2 6pin connectors.
March 15, 2014 6:59:02 PM

im having the exact same thing except the 8 pin cpu connector from the psu is not detachable meaning i cant split it in half to only a 4pin i think. although the whole thing fits in the 8pin on the board like the picture. but strangely like you, the layout is different with the rounded and non round connectors.
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