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Thread: Peltier cooling

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    Peltier cooling

    I was wondering anyone could tell me what voltage the vans on a GPU run at? The reason I want to know is Because I'm interested in trying out some custom cooling with a 12v peltier module (TEC1-12706 specifically) on my old GTX 550ti

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    Re: Peltier cooling

    There is no standard.

    Some use a very simple 2 pin solution with voltage change controlling the fan speed. Others use a PWM approach with 3 / 4 pins.

    Either way, if the voltage is changing it's not going to be of much use. I suppose you could look at some software to set the 'fan speed' to maximum, but it's not really a nice solution.
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    Treasure Hunter extraordinaire herulach's Avatar
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    Re: Peltier cooling

    You realise thats a 90w part right? It'll fry the headers on the gpu

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    Re: Peltier cooling

    Quote Originally Posted by herulach View Post
    You realise thats a 90w part right? It'll fry the headers on the gpu
    This, frankly - fans only pull a few watts, far less than the peltier, and most 12v fan headers will only provide one or two amps, not the 6A that this can draw.

    You'll still need to run a heatsink and fan for the peltier anyway, so you'll need to use the fan headers to run that.

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    Re: Peltier cooling

    Peltier 'coolers' are a misnomer. They are heat transfer devices (and consume energy in the process) So one side gets cold, the other side gets hot. The hot side then needs to be cooled, i.e. the heat it is extracting from the GPU needs to be removed from the Peltier hot side. If you can mount the hot side on the PC case and the cold side on the GPU, then you could use the PC case as the heat sink - better still, mount the Peltier hot side on a heat sink outside the PC case - but the design of PC cases and the mounting arrangements of the GPU make that nearly impossible to do. So you end up with an internal fan cooling the hot side of the Peltier device, and because the Peltier device itself consumes energy, you are adding to the thermal management problem, not reducing it.
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    Re: Peltier cooling

    Better to juice it from a molex. Also beware of condensation dripping onto parts below (esp if you have bottom mounted PSU)

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    Re: Peltier cooling

    Quote Originally Posted by peterb View Post
    Peltier 'coolers' are a misnomer. They are heat transfer devices (and consume energy in the process) So one side gets cold, the other side gets hot. The hot side then needs to be cooled, i.e. the heat it is extracting from the GPU needs to be removed from the Peltier hot side. If you can mount the hot side on the PC case and the cold side on the GPU, then you could use the PC case as the heat sink - better still, mount the Peltier hot side on a heat sink outside the PC case - but the design of PC cases and the mounting arrangements of the GPU make that nearly impossible to do. So you end up with an internal fan cooling the hot side of the Peltier device, and because the Peltier device itself consumes energy, you are adding to the thermal management problem, not reducing it.
    Thanks, that's an awesome description of how peltiers work, it's one of those things I've been curious about for a long time.

    Now I thought that peltiers had an additional problem, to the power and thermal issues that have been described by peterb, and this is with the cold side. I have read somewhere that the cold plate gets so cold that it can introduce condensation into the case and if that condensation is not dealt with correctly you could be looking at liquid making contact with components, that would prefer to remain dry.

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    Re: Peltier cooling

    Quote Originally Posted by KeyboardDemon View Post
    ... I have read somewhere that the cold plate gets so cold that it can introduce condensation into the case and if that condensation is not dealt with correctly you could be looking at liquid making contact with components, that would prefer to remain dry.
    Any time you cool something to below ambient temperature you risk condensation forming, and mixing water with electronics rarely works out well (even if you don't cause a short circuit you risk corrosion of the conductors). So a lot depends on how effective your peltier is and how high or low the ambient temperature is. There are a number of interesting ways to handle peltiers in PC cooling, but they all require working around some common issues (including the additional heat load of the cooler and the risk of condensation). Unless you're very confident in your engineering abilities, they're probably not worth the hassle.

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    Re: Peltier cooling

    The old method was peltier onto CPU, water cooling to cool the peltier, with insulation in the form of dielectric grease inside the CPU socket and surrounding area, and neoprene.

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    Re: Peltier cooling

    Quote Originally Posted by Macadee View Post
    The old method was peltier onto CPU, water cooling to cool the peltier, with insulation in the form of dielectric grease inside the CPU socket and surrounding area, and neoprene.
    yeah it never was very elegant

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    Re: Peltier cooling

    Not very elegant or particularly useful but for sure fascinating to have a heat pump.

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