PSU only has 2 X 8 pin for PCI but GPU requires 3

Discussion in 'Troubleshooting Help' started by S.han, Sep 22, 2021.

  1. S.han

    S.han Member

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    Hi, I am using silver stone 800w sfx-l and recently purchased 3080 gaming trio Z which has 3 ports.

    The GPU only has 2 PCI ports and comes with 2 normal cables.

    When I only connect 2 cables to GPU, middle and right ports, PC powers up and fan spins but the monitor shows black screen (does not say no signal)

    Is there anyway I can bypass this problem or place where I can buy daisy chained cables that is safer to use?
     
  2. Coma White

    Coma White Member

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    Are there no adaptors for additional power provided with the card?
     
  3. rthy

    rthy Member

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  4. O-B-E-L-I-X

    O-B-E-L-I-X Member

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  5. OP
    OP
    S.han

    S.han Member

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    Yeah it is. I must have lost them.

    I managed to get replacement cables but this one only has 8&6 pin connectors.

    Can I connect 8/8/6 to 8/8/8 pin GPU?
     
  6. OP
    OP
    S.han

    S.han Member

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    There is no adaptor provided.
    I read the manual and contents are just GPU, stand and manual
     
  7. pwlm1975

    pwlm1975 Member

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    It may. Power draw rated at 370W, which can be drawn from 2 x 150W (8-pin PCIe) plus 75W from the motherboard slot. You can only try. I wouldn't use adapters on such a beastly power draw.
     
  8. Elmf

    Elmf Member

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    Get another 8 Pin PCI-E Cable for that PSU. As above from another OCAU, the PSU supports it (and comes from factory with it). Only recommended way when dealing with equipment of this value and power draw.
     
    S.han likes this.
  9. OP
    OP
    S.han

    S.han Member

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    Hey!! Thank you for leaving reply! I am struggling to find SFX PSU that has 3 PCIe cables.

    I am leaning towards to use 2 PCIe and 2x molex to pcie cable.

    Or just getting a generic PCI Y splitters.

    I know the system will be less stable and not recommended, but I wanna see how it runs before spend more money on gpu
     
  10. Elmf

    Elmf Member

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    I'm a bit confused now mate, you said you had this psu: https://silverstonetek.com/product.php?pid=731

    that PSU can have 4 x PCI-E cables attached to it. It actually comes with these cables. https://silverstonetek.com/product.php?pid=731#lg=1&slide=4

    So all you need to do is find online some PCI-E Cables compatible with the PSU you've already got, plug them in and you're good to go!

    Personally I wouldn't use Molex adapters for such a heavy load with such expensive gear.
     
  11. Elmf

    Elmf Member

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  12. OP
    OP
    S.han

    S.han Member

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    It has 8 and 6 pin Y splitter not 8 and 8 pin.

    So I cannot get the combination of 8/8/8 pins but 8/8/6 pin at most.
    The GPU requires 8/8/8


    I actually bought the whole pack, from first link yesterday. I guess I got the last stock available haha.
    In the pack, it only comes with 8&6 combo cables as well, no 8&8
     
    Last edited: Sep 23, 2021
  13. OP
    OP
    S.han

    S.han Member

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    It comes with 4 cables but only 2 ports are available :-(
     
  14. OP
    OP
    S.han

    S.han Member

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    I tried, no signal to the monitor :-(

    I am thinking of using 2 molex to 1 PCI adaptor for another 8pin supply.
     
  15. Elmf

    Elmf Member

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    So is the problem that you only have 2 x of the blue ports? So you can only plug in 2 x of these https://www.silverstonetek.com/product.php?pid=358&area=en?

    Therefore you can only get 2 x 8pin?

    Do the ones that come with it only plug into the Blue ports too? Or can they fit into the PSU side black ports on the left hand side? If so, that just doesn't make sense, I doubt they would provide 4 x 8pin PCI-E but only have 2 ports on the PSU to plug them into. Something ain't sounding right.
     
  16. 151528

    151528 Member

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    I have a silverstone 700w sfx psu, and it has 2 pcie cables, each with 2 x 6+2 connectors on the end, for a total of 4 x pcie 8 pin connections

    OP I suggest you post photos of your psu/cables before spending any money or using adapters, I think this problem could be easily solved
     
    Last edited: Sep 23, 2021
  17. OP
    OP
    S.han

    S.han Member

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    [​IMG]
    This is the cable side of my PSU. there are 8 pin ports. the black one is being used for CPU and blue ones are for GPU.
    There are no other ports on the other sides.

    The cable definitely comes in either single 8 pin or dual 8/6 pin.

    I am assuming the design is unusual as it is for ITX size?
    But yeah i am a bit confused. I would expect connectibility of 3 x 8pins or more for 800w+ plat
     
  18. OP
    OP
    S.han

    S.han Member

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    It is definitely this PSU. the spec sheet states that it comes with 8/6 cable, not 8/8. I wish if it was easily solvable but it seems to be tough one
     
  19. Elmf

    Elmf Member

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    Yeah so it sounds like you're saying the 4 on the left are only for molex/sata, big one is atx, 8pin black is cpu and 4pin black is cpu extra power, leaving 2 x 8pin for pcie only. If so, that sucks.

    BUT - if you had the original cables you'd still have no issue, as 15128 posted above each cable has 2 x 8pin on it...meaning 2 cables = 4 x 8 pins


    The photos show 8/6pin. Meaning it's a 6pin with a little side plus2 connector. Have you inspected them? To shut us up, show us a photo of the secondary pcie connector being only 6 pin and we will go back to our boxes :p
     
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  20. shmity

    shmity Member

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    Elmf likes this.

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