MXM Power Connector

Discussion in 'Sager and Clevo' started by DefinitelyCam, Feb 5, 2021.

  1. DefinitelyCam

    DefinitelyCam Notebook Enthusiast

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    Hello All!

    First time poster, overnight viewer. I've spammed this forum the last 12 hours trying to find the name for MXM external power connectors.

    I am working on a custom project that takes a STX MXM motherboard and uses it for my main gaming pc (I only play World of Warcraft XD). But to get the GPU I want, Clevo RTX 2070, requires external power.

    My next move is creating some sort of adapter to power these GPUs. But I have no idea about pin layout, a closer look also shown here in a recent post.

    Any help is appreciated and I believe @Khenglish is rather versed in these, if you are able to help. Thanks!

    These are the main motherboarrds I have been looking at:
    B360 STX MXM
    https://detail.1688.com/offer/597442006068.html?spm=a26352.13672862.offerlist.95.55e272ffWFsUDE

    Z370 STX MXM
    https://primebuy.com/product/asrock-mxm-ipc-q370-12v-motherboard-2xm-2-key-m-1xm-2-key-e?msrc=gglds
     
    Last edited: Feb 5, 2021
  2. thewizzard1

    thewizzard1 Notebook Geek

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    Not only do you need external power, you'll need to modify your MXM slot for the 1.8vE and 3.3vS wires - You can basically follow this thread:

    http://forum.notebookreview.com/thr...ix-gets-an-8700k-and-gtx-1080-upgrade.814711/

    The power connector for Clevo MXM itself can be sourced from HP laptop power jacks - Many carry the right connector, with between 4 and 8 pins. You want the 8-pin variety, and they can be had for less than $10.

    I've performed this mod on my own Asrock Deskmini B250 board, but I was working with a deficit of cards at the time, and undid the mod. I will be reattempting this soon.
     
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  3. DefinitelyCam

    DefinitelyCam Notebook Enthusiast

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    Do you know the pinout on this connector? Would you just connect another DC power connect to it or wire it internally?

    Then I summon @Mr. Fox as well :) for his small large, very large insight.
     
    Last edited: Feb 5, 2021
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  4. thewizzard1

    thewizzard1 Notebook Geek

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    Yeah, it's exactly like this:

    https://i.imgur.com/VsU60sn.jpg

    Should accept standard 19v, I'd suggest sourcing that from the power side of the adapter on the motherboard, not direct from the plug.
     
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  5. Mr. Fox

    Mr. Fox BGA Filth-Hating Elitist

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    Feel free to browse my imgur album and use anything you find useful. I am by no means an expert or genius at this stuff. I merely grab information from people that know more than me, such as @Khenglish, @Prema and lots of other people that know more than me. It probably would not be far off base to call me a hack. I know just enough to be dangerous and I am sometimes daring (or dumb) enough to take a stab at something crazy.

    P870DM-G 8700K and GTX 1080 Mod
     
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  6. DefinitelyCam

    DefinitelyCam Notebook Enthusiast

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    That's wonderful. I guess my only true question is to verify the external connector takes 19V or is it 12V like a PCIe connector. I'm an electrical engineer so I can most likely do some of the mods with some direction. Assuming Khenglish explains the process. My only thought is with a STX motherboard, there isn't auxiliary power I can use to power the MXM external power. Id have to adapt a PCIe connector or a DC Adapter depending on voltages. I really hope it isnt something like 3.3V. I could look up pinout for the auxiliary ports on your laptop mod.
     
  7. Khenglish

    Khenglish Notebook Deity

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    The left 4 pins are 19V power and the right 4 are GND. The GND through the MXM slot is substantially stronger than this cable and you don't need to connect it. You do need to add the 19V lines though. 10 series use it for the RAM and 4/6 of the core phases. 20 series exclusively use the power cable with zero use of the 19V power tab on the MXM tab.
     
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  8. DefinitelyCam

    DefinitelyCam Notebook Enthusiast

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    So my only question here is how would you go about creating this adapter at 19V? Would you just get a normal DC Dell power jack and split the normal adapter input to the board and to the card?
     
  9. DefinitelyCam

    DefinitelyCam Notebook Enthusiast

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  10. Khenglish

    Khenglish Notebook Deity

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    That would be bad. You need to not bypass the power switch on the motherboard to power the card. Either solder a wire to the 19V pins on the MXM connector, or to the output of the power transistors on the motherboard.

    If you give me a picture of the motherboard I can show you where to grab power from.
     
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