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Will a CPU extra psu cable work in a Graphics Card PCI-E connector?

My XFX Pro 850 Watt PSU has two extra spaces for PCI-E / CPU. I would like to SLI my Asus GTX 770 but don't know if it will work. The PSU is SLI certified for SLI and I have enough wattage but as it is a semi-modular PSU, there is one problem I have. The cables that came with the power supply are ONE PCI-E connector and ONE CPU extra connector. They both fit into the same slot in the power supply end and both look the same on the other end (the end that goes into the component) Will the CPU Extra cable fit in the Graphics Card, do I need a new PSU or just an extra cable? Any recommendations on any of the above? Please help!!! Thank you

Beast Mode Ben
8 answers Last reply Best Answer
More about cpu extra psu cable work graphics card pci connector
  1. I' says 6 pcie connectors. It shows 5 with the cpu. It also says single 12v rail - so everything is from the one 12v rail.

    To me it looks like you can use the cpu power also for pcie power. You'd have to try to see if it fits. But don't you need the cpu power for your motherboard? Edit - there's also a motherboard connector. So go ahead.
  2. it won't fit, the pins are different shape. you may even break the slot or burn the psu. you need another cable for the second pci-e power connector
  3. The 4/8 mobo connector should be part of the main cable group, as should the other 8 pin connector. Either one of these should be used on your motherboard. The PCIe connectors will be part of the modular side, and should have been supplied with the psu when new. Apart from the fact that the connectors are keyed a certain shape to prevent misuse, there is also a difference in wire locations on the pins, you don't want to put 12v to ground on the gpu. In other words, I wouldn't suggest using the EP12V as PCIe. They will be labled what they are for.
  4. So should the CPU cable work or do I need a new PSU or is there somewhere where I can get spare cables? The CPU and PCI-E connectros look EXACTLY the same and they're all of the same rail, so...
  5. http://xfxforce.com/en-us/products/all-previous-psus/pro-series-850w-psu-black-edition-p1-850b-befx

    One 18pin and 10pin connector are used to go to the motherboard 24pin connector.

    http://www.tomshardware.com/answers/id-1717374/questions-xfx-pro-850w.html

    There's 2 connections on the psu for cpu. Use either one for the motherboard connection.

    The spec says 6 pcie connectors. Counting the other cpu connector on the psu, there are then 6 slots left.

    So use all 6. You should have 6 pcie cables. You only need 4 for 2 x 770's
  6. i7Baby said:
    http://xfxforce.com/en-us/products/all-previous-psus/pro-series-850w-psu-black-edition-p1-850b-befx

    One 18pin and 10pin connector are used to go to the motherboard 24pin connector.

    http://www.tomshardware.com/answers/id-1717374/questions-xfx-pro-850w.html

    There's 2 connections on the psu for cpu. Use either one for the motherboard connection.

    The spec says 6 pcie connectors. Counting the other cpu connector on the psu, there are then 6 slots left.

    So use all 6. You should have 6 pcie cables. You only need 4 for 2 x 770's


    Ok, so will the CPU 8pin power connector woek as a PCI-E connector? And also, the link above is not my power supply, that is the black edition and I have the XXX edition which is only semi modular rather than fully modular.
    P.S Thanks for all your help so far!
  7. Best answer
    Should've said. I'll look again.

    http://hexus.net/tech/reviews/psu/46501-xfx-850w-proseries-xxx-semi-modular-bronze-psu/ says -
    PCIe 2x 6+2-pin (55-60cm) captive
    2x 6+2-pin (55-60cm) modular

    so you should have 2 x 6+2pins from the non-modular side and and other 2 from the modular side. That's all you need.
  8. i7Baby said:
    Should've said. I'll look again.

    http://hexus.net/tech/reviews/psu/46501-xfx-850w-proseries-xxx-semi-modular-bronze-psu/ says -
    PCIe 2x 6+2-pin (55-60cm) captive
    2x 6+2-pin (55-60cm) modular

    so you should have 2 x 6+2pins from the non-modular side and and other 2 from the modular side. That's all you need.


    Ok, Thanks so much for the help!!! :D
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