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Thread: 8+8 pin on a single PCIE cable

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    Default 8+8 pin on a single PCIE cable

    I apologize if this has been covered before, but extensive googling has still turned up very little if any useful information...

    I wonder if JonnyGURU (and forum members?) would know?

    Why would a single PCIE cable have two 8pin ends on it if it cannot supply the current needed for a 8+8pin GPU?

    We know that 8pin is 150w, so an 8+8 *can* supply up to 300w... but is that safe on a single PCIE cable?

    If it isn't, why do these cables exist, straight from the manufacturer? It's not like it's a cheap Chinese adaptor cable...

    I am having a hard time finding the safe current maximum for 18ga and 16ga wires as well, since there are 3 +12v wires in a PCIE cable, as long as they can safely carry 8.3a+ then there shouldn't be a problem?

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    Because its cheaper and for most cards that need either 2 6pin or 6+8pin its enough.
    And you need less cables, less pins on the PSU -> Cheaper.

    In recent times the GPUs that have two 8pin seem to need 8pin and it makes more sense to use two cables for safety reasons to not overload the connectors on the PSU side...


    That isn't an issue with fixed cables if the cables are thick enough and made of Copper, not Aluminium....
    See AWG tables for more information on this...

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    From what I'm gathering, if the GPU will be using greater than 225w, two separate cables should be used. If it is using 225w or below, a single cable should suffice.

    This graphic from Seasonic is pretty clear:

    Attached Images Attached Images

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    Quote Originally Posted by GoStumpy View Post
    From what I'm gathering, if the GPU will be using greater than 225w, two separate cables should be used. If it is using 225w or below, a single cable should suffice.

    This graphic from Seasonic is pretty clear:
    Seasonic uses 18awg cables, some other brands (such as Corsair and some Coolermaster) use 16awg cables which can handle it a bit better.

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    They put jumper / pigtail / daisy-chain cables in your pouch because some low-power Grfx cards can in fact use them & may also benefit from cable mngmnt; once you reach Titan / 1080Ti level cards over 225w, you'll want two cables to power it, not much use in asking why, because at the end of the day, you should still defer to, trust & go by Seasonic's Chart

    Quote Originally Posted by none77 View Post
    Corsair don't use 16AWG (pci-e) for all PSU
    1st of all, the white sleeved heatshrink-less cables is a bad example, of course you won't get 16g when sleeved

    2nd, if it bugs you they didn't supply a 16g cable, buy some, $5 each
    So now what's the problem?

    Package contents:
    • x1 Type 3 Sleeved Black PCIe Pig Tail Cable
    Compatibility:
    •Compatible with all Corsair type 3 pin out PSU

    PSU CABLE COMPATIBILITY
    Explanation of RMi's New Type 4 Cables
    "Type 4 cables have the same pin-out as Type 3 cables"
    Last edited by Cass-Olé; 01-21-2018 at 06:00 AM.
    Surfin' with the Alien

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