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    MXM Vram chips and heat on underside of card.

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by kosti, Nov 29, 2015.

  1. kosti

    kosti Notebook Virtuoso

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    I know some newer heatsinks are designed to provide heat dissipation to the Vram chips on the underside of the MXM boards, but what about older models? My M15X heatsink only provides an aluminum plate for heat dissipation on the Vram chips on the top side of the MXM board. What about the bottom Vram modules. I'm sure those get just as hot since they are GDDR5 chips. Any thoughts and suggestions? I haven't been able to find much about this on the web.
     
    kosti, Nov 29, 2015
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  2. Robbo99999

    Robbo99999 Notebook Prophet

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    On my M17xR3 the underside VRAM chips are cooled by pads that are just in contact with the motherboard - so the heat sinks into the motherboard from those VRAM chips - maybe you could do the same?
     
    Robbo99999, Nov 29, 2015
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  3. kosti

    kosti Notebook Virtuoso

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    Did your laptop come stock with those or were they added? Do you recall the thickness of the pads? Do they look something like this (from an Xbox 360):
    [​IMG]
     
    kosti, Nov 29, 2015
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  4. Robbo99999

    Robbo99999 Notebook Prophet

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    Yep, came as stock with something like 1.5mm thick pad of about 2cm x 3cm rectangle - so 1 pad to cover 1 bank of RAM chips (the other bank of RAM chips is actually covered by a heat spreader that is part of the X-bracket. Just the standard material that is used in pads for VRAM chips.
     
    Robbo99999, Nov 29, 2015
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  5. kosti

    kosti Notebook Virtuoso

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    I see, thanks for that info. I'm thinking that those pads are used to connect to the aluminum cage on the M17X to help dissipate heat from the VRAM. My M15X also has an aluminum cage so I am going to look into pads to use on mine.
     
    kosti, Nov 29, 2015
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  6. Robbo99999

    Robbo99999 Notebook Prophet

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    Yep, sounds good!
     
    Robbo99999, Nov 29, 2015
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  7. baii

    baii Sone

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    Some x bracket have a plate(AW mostly) for the back vram, many do not. I believe they run fine with nothing on anyways, and it is that way on a lot of machines.
     
    baii, Nov 29, 2015
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  8. vmartins45

    vmartins45 Notebook Enthusiast

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    Dissipation to the Vram chips?!

    Those that are in the back of the board need not, tried to measure the temperature to reach, is very low.
     
    vmartins45, Dec 1, 2015
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  9. kosti

    kosti Notebook Virtuoso

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    How did you measure the temps on the underside vrams?
     
    kosti, Dec 1, 2015
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  10. vmartins45

    vmartins45 Notebook Enthusiast

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    Sorry my weak English, I'm Portuguese and translation programmes do not always help.

    I was saying that the memories that are next to the graphics chip our from the back of the board, almost no heat.
     
    vmartins45, Dec 2, 2015
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  11. kosti

    kosti Notebook Virtuoso

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    obrigado :)
     
    kosti, Dec 2, 2015
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  12. vmartins45

    vmartins45 Notebook Enthusiast

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    De nada, amigo sempre ao seu dispor. :cool:
     
    vmartins45, Dec 2, 2015
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  13. Robbo99999

    Robbo99999 Notebook Prophet

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    Doesn't hurt to pad them though anyway, I wouldn't feel happy leaving them bare.
     
    Robbo99999, Dec 2, 2015
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  14. vmartins45

    vmartins45 Notebook Enthusiast

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    In most new laptops do not bring thermo-pads. Keep, unless some exception, not be necessary.
     
    vmartins45, Dec 2, 2015
    #14