ATX 8 pin to PCIE 8 pin power - matching up wires
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Thread: ATX 8 pin to PCIE 8 pin power - matching up wires

  1. #1
    Join Date
    Jan 2019
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    3

    ATX 8 pin to PCIE 8 pin power - matching up wires

    I need to go from my power supply's 8 pin ATX output to the 8 pin PCIE on my graphics card. I realize the pin configuration is different, but I have both connectors. I want to make them into an adapter. Can I just cut the wires and match up yellow to yellow (12v) and black to black (grounds)? I know PCIE has 2 voltage regulating wires (which are also black) so I wasn't sure. The reason I have to do this is because I threw away the wires that came with my PS, thinking I wouldn't need them. Now I do.

    Thanks

  2. #2
    Join Date
    Feb 2000
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    Idaho Falls, Idaho, USA
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    You could splice and dice the wires you have (checking a wiring output diagram for your power supply first), but I wouldn't. A better solution is to contact the power supply manufacturer (Corsair, etc.) and request a replacement cable. That is what I would do.

    Next time, I would keep the cables, or, you could e-bay them, which would be another potential source for the cables.

  3. #3
    Join Date
    Jan 2019
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    3
    The cables seem hard to come by on ebay. There are lots of cables, but not the right ones. My Thermaltake PS only has the ATX 8 pin outputs and the 6-pin Sata outputs; which leads me to believe if I ever had the right cable to begin with. Even if I had an 8 pin male to male PCIE cable, there likely wouldn't be anywhere to plug it into on my PS. I do have the Molex to 8 pin PCIE adapter. The problem is, I only have 1 string of molex power connectors and the adapter requires 2 molex plugins (which shouldn't be on the same string). So now, I think I need to buy a sata to molex adapter, then use the molex to 8-pin adapter and connect it on both strings. I tried connecting my GPU on the same string with the molex adapter and it wouldn't post. What a nightmare...

  4. #4
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    Feb 2000
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    Idaho Falls, Idaho, USA
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  5. #5
    Join Date
    Jan 2019
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    3
    Thanks for that. The motherboard not posting with the new card was due to it needing a uefi/bios update. I was able to get the molex adapter to work. I'm not sure if each output on the PS corresponds to a separate circuit. If so, It might be beneficial for me to get that cable as to not have my GPU on the same circuits as my SSDs.

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