Motherboard 8 pin connector, PSU had 4+4 pin connector? what to do?

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TomCMF

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Sep 9, 2015
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Hello,

I recently bought a Corsair HX850i COR 850W PSU from amazon, anyways I own a ITX MSI Z270I GAMING PRO CARBON AC motherboard and, I found out that the 850 HXi has a 4 + 4 pin CPU cable which doesn't fit my CPU connector on my motherboard which requires a 8 pin :
Heres a image of my problem.
Motherboard CPU connector: http://i.imgur.com/NGnVx4l.jpg

PSU HX850i CPU connector:
http://i.imgur.com/VjZRR5u.jpg



Clearly they dont fit, I attached the other part which fits, but it isn't giving enough power to the CPU.

I dont want to really return the PSU, and I was planning on buying a sleeved cable set from Corsair, but I was wondering if any websites sell a 1 x 8-pin ATX 12V power connector sleeved???

Or what can I do to fix this problem?

Edit: I tried starting up my PC and it says no Signal found, i am pretty sure this has to do with the cable not giving enough power to the motherboard?


SOLUTION: just use the half of the pin that fits.



 
Solution
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The ATX12V specification includes a 24 pin main connector and a 4 pin (2x +12v, 2x GND) connector for auxiliary CPU power.

The EPS specification includes a 24 pin main connected adopted from ATX12v, an 8 pin (4x +12v, 4x GND) connector for auxiliary CPU power as well as two optional 4 pin connectors.

Some motherboards such as the Asus Rampage IV Extreme, require an EPS compliant power supply, meaning that they have a 24 pin connector, an 8 pin connector, and atleast one 4 pin connector.

Most consumer motherboards are either ATX12V or EPS without the optional 4 pin connector.

The 8 pin connector on the EPS specification is key-compatible with half of the 4 pin connector on the ATX12V specification. By adopting a 4+4 configuration...
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TomCMF

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Wouldn't it destroy the motherboard? if I ignore the shapes?
 
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Dark Lord of Tech

Dark Lord of Tech

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Use the 4+4 in this manner highlighted in red.
T81lGOo.png
 
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TomCMF

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I dont think you guys get it, I tried turning around and the other side won't fit to the PSU, Since it has 6 semi round pins and 2 square pins
I need one with 4 square pins and 4 semi round pins in order for it to fit. Heres a image of how the pins look like
Circle = Semi circle, and Square = well square pins.
CPU Cable image: http://i.imgur.com/jtYTdok.jpg
Motherboard connector image: http://i.imgur.com/BgztsSM.jpg

Half of the cable does fit to the CPU connector, but its not giving enough power to the CPU.
 
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TomCMF

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I contacted corsair to see what to do, but they said they will reply within 2 days.
 
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TomCMF

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I just latched it over and ignored the shapes, and my motherboard doesn't seem to be damaged yet, but atm I am getting no signal on my monitor.

I correctly placed every PSU cable in and my GPU is properly placed in, so is the ram.
 
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teknobug

teknobug

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Weird I don't remember ever seeing a PSU connector having 4 rounds in a single half plug before, it's supposed to be what the motehrboard socket looks like. I think the issue here is the PSU, not the motherboard.
 
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TomCMF

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Ye, I been trying to fin a single 8 pin connector with 4 squares and 4 semi circles, but I can't find any 8 pin connectors online that arent extensions, plus I am trying to buy sleeved cables.
 
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TomCMF

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Well Corsair told me that the PSU cable is not the problem and that the half connector should give enough power to the CPU, now I dont really know what to do? all of my stuff is correctly placed in and my monitor is saying no signal. Might have to take my PC apart and rebuild it again.
 
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Pinhedd

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The ATX12V specification includes a 24 pin main connector and a 4 pin (2x +12v, 2x GND) connector for auxiliary CPU power.

The EPS specification includes a 24 pin main connected adopted from ATX12v, an 8 pin (4x +12v, 4x GND) connector for auxiliary CPU power as well as two optional 4 pin connectors.

Some motherboards such as the Asus Rampage IV Extreme, require an EPS compliant power supply, meaning that they have a 24 pin connector, an 8 pin connector, and atleast one 4 pin connector.

Most consumer motherboards are either ATX12V or EPS without the optional 4 pin connector.

The 8 pin connector on the EPS specification is key-compatible with half of the 4 pin connector on the ATX12V specification. By adopting a 4+4 configuration, PSU manufacturers can ship products that are fully compatible with motherboards that use either the ATX12V specification, or the EPS specification. When the ATX 12V specification is used, one 4 pin connector is attached to the auxiliary power connector. When the EPS specification is used, two 4 pin connectors are ganged together into the 8 pin socket, and any additional 4 pin connectors are connected as well.

Note that ATX12V PSUs can be used in EPS systems. Half of the 8 pin connector will remain unpopulated, as will any additional 4 pin connectors. This is not recommended as the system may not be able to draw the current that it needs.
 
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