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Splitting internal USB 2.0 cables

Ladies and gentlemen,

Currently in my system have 3 devices which need to connect to an internal USB header on the motherboard (AIO cooler, LED strips and front USB ports) but only 2 physical headers on the motherboard with which to connect them. Wondering what the best way of accomplishing this is. After much searching Google and eBay the best I could find is something like THIS.

However, I've read conflicting things, some say that a simple cable won't work as you need a hub to be able to properly split between the 2 devices connected to the single header.

I'm wondering what the best / tidiest way of handing this situation is.

Oh and before you suggest something like THIS, I need it be be all internal connections, i.e. 1 x female internal USB to 2 x male internal USB, not 1 x female internal USB to 2 x female internal USB.
6 answers Last reply Best Answer
More about splitting internal usb cables
  1. I'd say an internal pcie usb expansion card https://www.startech.com/uk/Cards-Adapters/USB-2/Card/4-Port-PCI-Express-Low-Profile-High-Speed-USB-Card~PEXUSB4DP would be your best bet. A header only supplies enough power for two ports. Splitting & adapting can lead to power issues if the devices plugged in are demanding.
  2. Multipack said:
    I'd say an internal pcie usb expansion card https://www.startech.com/uk/Cards-Adapters/USB-2/Card/4-Port-PCI-Express-Low-Profile-High-Speed-USB-Card~PEXUSB4DP would be your best bet. A header only supplies enough power for two ports. Splitting & adapting can lead to power issues if the devices plugged in are demanding.


    Hmmm not the worst solution, only problems I can see is I only have a 4790k, so 16 lanes of PCIe and hoping to keep all those lanes for the video card haha. Was also hoping for a subtler solution if there is one :P

    But I'll keep that in mind.
  3. Ok guys so after a bit more research I may have found a solution, but I'd like to check if it will work.

    So below I've pictured the pinouts for the header on the motherboard:



    From what I understand, the top and bottom rows are for a USB port each equally. So 1 USB device will use 4 pins, 2 USB devices will use 8 pins, and the 9th pin has no connection.

    Now, for the 2 devices I need to plug into the USB header, one only has a single row anyway, and the other has a connector that has 2 rows, but there is only 1 row of wires going into the connector, so the other row although the connector will take up that space, doesn't connect to anything.

    My solution is that I pick up one of the splitter cables mentioned in the OP, and make sure that say the bottow row of pins on the connector has 1 row of wires coming out of one split, and the top row of pins coming out of the connector has the other row. So it'll be as if there's only 1 wire for each pin anyway.

    Does my explanation make sense / will it work?

    Thanks guys
  4. BUMP

    Any thoughts? Anybody?
  5. Best answer
    First of all any pcie x1 card doesnt use cpu lanes, motehrboard chipset also has 8-12 lanes so that the 16 lanes from the cpu to be used only by the videocard/videocards, so dont worry use any pcie x1 your cpu lanes will remain untouched.
  6. Just cut connectors off so each one fits one row of four pins with odd or even numbers.
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