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Thread: Running pump directly to CPU/GPU?

  1. #1
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    Running pump directly to CPU/GPU?

    I'm curious... Would I see any difference in water temperature if I have it setup like this

    rad -> res -> pump -> cpu or gpu?

    Instead of the typical (normal)

    res -> pump -> rad -> cpu or gpu?

    I would figure that the water leaving the pump would be just as cool as if it was going through the radiator first?

    Any thoughts? I'm new to watercooling and going to dive into a setup soon. I've read that loop order doesn't really mater too much in terms of overall temperature, but I'm curious about the setup I want to go with. pump to gpu/cpu first instead of pump to rad first.

  2. #2
    A thing of beauty is a joy forever! Movieman's Avatar
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    Quote Originally Posted by 3dchipset View Post
    I'm curious... Would I see any difference in water temperature if I have it setup like this

    rad -> res -> pump -> cpu or gpu?

    Instead of the typical (normal)

    res -> pump -> rad -> cpu or gpu?

    I would figure that the water leaving the pump would be just as cool as if it was going through the radiator first?

    Any thoughts? I'm new to watercooling and going to dive into a setup soon. I've read that loop order doesn't really mater too much in terms of overall temperature, but I'm curious about the setup I want to go with. pump to gpu/cpu first instead of pump to rad first.
    coolest water should be what is coming out of your rad so you want that going to the cpu..
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  3. #3
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    Quote Originally Posted by 3dchipset View Post
    I'm curious... Would I see any difference in water temperature if I have it setup like this

    rad -> res -> pump -> cpu or gpu?

    Instead of the typical (normal)

    res -> pump -> rad -> cpu or gpu?

    I would figure that the water leaving the pump would be just as cool as if it was going through the radiator first?

    Any thoughts? I'm new to watercooling and going to dive into a setup soon. I've read that loop order doesn't really mater too much in terms of overall temperature, but I'm curious about the setup I want to go with. pump to gpu/cpu first instead of pump to rad first.
    difference are small, with good enough waterflow it would only be a few 0.1 C difference. Go the shortest route between all components makes tube length shorter and one gain higher waterflow. At end temp in loop will end up at same temps no matter how you place components in loop. If u plan go heavy overclocking one would want cpu to be first component right after radiator....

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    Thanks for the feedback guys, It's appreciated. Will definitely take notes on when it's time for setup.

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    Love will tear us apart WrigleyVillain's Avatar
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    Yeah most of the scientific testing by Martin etc found a temp equilibrium is reached in the loop fairly quickly. As far as order it's really whatever works best for you and your setup. Most will say run the res right before the pump but that's mainly so its never starved for water at all during filling. There is no flow rate benefit or anything else to component order as far as I have ever known.
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    Xtreme Cruncher Kurz's Avatar
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    Quote Originally Posted by Movieman View Post
    coolest water should be what is coming out of your rad so you want that going to the cpu..
    Eeep you are behind the times.


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    Xtreme Guru Church's Avatar
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    Kurz: depends. Though temp difference at any point of loop is small, and generic consensus these days is to route tubing however its shorter/simplier/with less tight bends with exception of always putting res before pump .. but in those cases where tubing routing is almost same this way or another, why not use old thoughts like rad before main cooled component (cpu wb) aswell?

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    Quote Originally Posted by Kurz View Post
    Eeep you are behind the times.
    Actually, the water out of the rad has a lower temp vs going in. It's an extremely small difference that won't make a difference for many but it might matter for extreme OC.

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    Xtreme Guru Church's Avatar
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    wes: Though theoretically it IS possible that half degree celsius is not enough for "next step" in OC, but practically i doubt that coincidence and i doubt anyone would like to overclock including those extra few MHz when simple heating up of ambient temps for half degree can rob that difference and making that overclock unstable again

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    Quote Originally Posted by WrigleyVillain View Post
    Yeah most of the scientific testing by Martin etc found a temp equilibrium is reached in the loop fairly quickly. As far as order it's really whatever works best for you and your setup. Most will say run the res right before the pump but that's mainly so its never starved for water at all during filling. There is no flow rate benefit or anything else to component order as far as I have ever known.
    +1 Just route it so that the Reservoir feeds the pump and pretty much every thing else doesn't matter what way you connect it all except maybe you want to have the water go to your most heat sensitive component like the CPU before the GPU. Other than that it really doesn't matter much.

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  11. #11
    Xtreme Guru Church's Avatar
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    Section8: imho with cpu wb before gpu blocks is just like with rad before cpu wb. If you can do it without complifying/lenghtening tubing by much, why not, otherwise almost as unimportant as first old "rule". IIRC to heat up water for one degree at 1.5gpm flow heat source of 600W was needed. These days main heat sources are heavily overclocked/overvolted i7 (upto 250W) and top GPUs like 5970/gtx480 (upto 300W?). One might say that some xtremeties like 3-way or 4-way SLI/CF of top GPUs might noticeably heat up water then, but usually in such xtreme builds there are separate loops, so not important point again?
    Last edited by Church; 08-24-2010 at 10:07 PM.

  12. #12
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    Quote Originally Posted by churchy View Post
    wes: Though theoretically it IS possible that half degree celsius is not enough for "next step" in OC, but practically i doubt that coincidence and i doubt anyone would like to overclock including those extra few MHz when simple heating up of ambient temps for half degree can rob that difference and making that overclock unstable again
    Noted, good point there.

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  13. #13
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    res -> pump, then do whatever you want.

    Personally I prefer res->pump->rad->cpus->nb/sb->gpus.
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  14. #14
    Xtreme Member Section8's Avatar
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    Quote Originally Posted by churchy View Post
    Section8: imho with cpu wb before gpu blocks is just like with rad before cpu wb. If you can do it without complifying/lenghtening tubing by much, why not, otherwise almost as unimportant as first old "rule". IIRC to heat up water for one degree at 1.5gpm flow heat source of 600W was needed. These days main heat sources are heavily overclocked/overvolted i7 (upto 250W) and top GPUs like 5970/gtx480 (upto 300W?). One might say that some xtremeties like 3-way or 4-way SLI/CF of top GPUs might noticeably heat up water then, but usually in such xtreme builds there are separate loops, so not important point again?
    Yeah your correct. Really it doesn't matter as long as your res feeds the pump everything else is really a mute point.

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