Dual Water Cooling Loop Problem

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Cody Johnson

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Feb 7, 2014
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Had 1 r9 290x with this water block:http://koolance.com/video-card-vga-amd-radeon-r9-290x-water-block-vid-ar290x with Big water 760 PRO pump/resv found here: http://www.newegg.com/Product/Product.aspx?Item=N82E16835106183. Everything was working great with temps staying steady between 55-60c. Bought another r9 290x and installed the connecting blocks: http://koolance.com/video-connecting-block-2-cards-3-slots-cnt-vdb2.
Here is my setup: http://s22.postimg.org/5q96z1r4h/pc1.jpg
problem is the second gpu I installed keeps getting hot. It takes a few minutes but it slowly climbs its way up to the 90c+ range so I have to shut down PC. I think my first video card might be sending hot water to second card or something but I don't know just guessing.
 
Solution
toolmaker_03
no you have two issues with your setup currently, the first issue is the total system flow, with the one pump you have the flow comes to a trickle by the time it hits the second card. the second issue is the radiator space provided to cool your components a 120mm of radiator for 2 components is nuts, even for one component it is a little small, I like at lest a 240mm radiator for each component but you might get away with 2 120mm.
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toolmaker_03

toolmaker_03

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I ran into the same issue when I was building my loop and this is what I discovered on how to fix the issues. I like to do parallel configurations on my setups now, so for your system I would have two radiators in parallel with each other in series with all three components, setup in a parallel configuration with each other, in series with two pumps evenly spaced from each other on the loop and a reservoir. that is what I would do let me know if this makes sense.

well here is a look at what I did, but I went all out

https://imageshack.com/i/f2r244j
https://imageshack.com/i/j6j1srj
https://imageshack.com/i/b50k5lj

and this is what I had before the reconfiguration of the loop to what I have now

https://imageshack.com/i/0zmodular004j
https://imageshack.com/i/0dpicks001j
https://imageshack.com/i/n5done001j

it was two separate loops one for the video cards that loop had two radiators in parallel with each other in series with two video cards in parallel with each other one pump and a reservoir in series with each other. the other loop was a complete series CPU loop only, that setup worked nice too.

 
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Cody Johnson

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The solution to my problem was very simply that I did something stupid during the installation of second water block. I forgot to take the plastic off of the heatsync pads. LOL case closed.
 
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Cody Johnson

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Hm. Case not closed. Cards are in sync now as far as temp for the most part but they both keep getting hot together now, with one finnaly stopping at about 79-80c and the other keeps climbing into the 90s until I have to reboot. Here is the manual for the block im using: https://koolance.com/files/products/manuals/manual_cnt-vdbx_d100eng.pdf as you can see I have it set up in accordance to "CNT-VDB2" in parallel.
 
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Cody Johnson

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if the problem was the radiator not being sufficient for the 2 gpus... why is 1 of them stable at 80c 100% load and the other gets hot if i try? shouldnt they both heat up together?
 
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Cody Johnson

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I disabled the video card that was getting hot and ran only the 1st gpu (on top) at 100% load and it steadied out at 70c. Then I disabled that video card and ran the one on bottom (one getting hot) at 100% load and it is at 85c and rising. So it's an issue with that card. Does my layout look correct as far as that PDF describes it should be setup in parallel? Maybe I should reopen the card and reapply thermal grease?
 
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Cody Johnson

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I know what you're saying about the radiator not being enough, but it seems like it should be good as long as I'm not OC. At stock, under load the big water 760 pro should be fine to keep both card at around 75c
 
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toolmaker_03

toolmaker_03

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Mar 26, 2012
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no you have two issues with your setup currently, the first issue is the total system flow, with the one pump you have the flow comes to a trickle by the time it hits the second card. the second issue is the radiator space provided to cool your components a 120mm of radiator for 2 components is nuts, even for one component it is a little small, I like at lest a 240mm radiator for each component but you might get away with 2 120mm.
 
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toolmaker_03

toolmaker_03

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Mar 26, 2012
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