Water cooling loop question.

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hahapingazzz

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Nov 10, 2015
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Hello, I'm building a ridiculously expensive complete overkill computer with two seperate loops and I am a little unsure about how to implement two pumps in a single loop.

I have the CPU loop all sorted but I'm stuck on the GPU loop, currently it would look like this;

Res > Pump > Res > Pump > Rad > Rad > GPU > GPU >>>

So my questions are:

1. Would this be an issue.. a pump feeding directly to another pump?

2. Or on another note, would having a pump feed directly in to a res be completely pointless. Or...

3. Would this work fine due to having a pump on either side of the loop one pushing the fluid through the rads then the blocks and then another on the other end sucking the fluid out? I'm very conflicted on how exactly it would work.



I would obviously much prefer to have it look more like this;

Res > Pump > Rad > Res > Pump > Rad > GPU > GPU >>>

But doing so using the middle and right side rads on a Thermaltake Core P7 would be pretty complicated to implement and would look rather messy.


Thanks in advanced to anyone willing to give their opinion or suggestions.
 
Solution
Seanie280672


Pumps dont suck, its the push force that pushes the fluid around the system, through the rads and blocks and back to the res in the end, all with a pushing motion.

To be honest, even that pump I liknked is probably overkill, but if you scroll down that page a little, you will see how the Res fits to the top, add a multitop for the return flow to the res...
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You won't need dual pumps for a GPU loop, even if it's an SLI setup, you're just making things complicated (and expensive) for no practical gain.
If you really want a dual pump setup why not treat each GPU to its own loop if motherboard spacing permits?
 
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As coozie7 said, you are just making things complicated.

Why would you want to do it like that ? all you are doing initially is pumping water from 1 res at high flow rates to another res, its pointless.

flow rate of water doesnt really make any difference to the cooling, and GFX card blocks are very restrictive anyway due to how thin the blocks themselves are and all the tight turns.

If you have 2 pumps, depending on what they are, you could always get something like this if they are D5 pumps: https://www.ekwb.com/shop/ek-xtop-revo-dual-d5-pwm-serial-incl-pump you can just buy the housing by the way, this is just for image purposes.
 
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My thoughts were that while one pump would be enough for two massive rads and two blocks, having two pumps would obviously perform better and ease up on the resistance of pushing through two rads and blocks.

Money is not an issue with this build, I'm going for the best of the best

The way I want to implement the loop it doesn't make it any more complicated at all, I'm just unsure what the optimal way to implement a dual pump loop would be.

Honestly I hadnt thought about having a seperate loop for each GPU, that would definitely be the best course of action but I feel like that would be even more complicated to implement
 
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Seanie I completely understand where you're coming from, and I had thought about that, but when you think about it a pump doesn't just push water out, it sucks water in as well, so sucking the water out of the blocks would still likely improve performance slightly wouldn't it?

Also how exactly would that dual pump you've linked me work? I hadn't seen one of them up until now.
 
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Pumps dont suck, its the push force that pushes the fluid around the system, through the rads and blocks and back to the res in the end, all with a pushing motion.

To be honest, even that pump I liknked is probably overkill, but if you scroll down that page a little, you will see how the Res fits to the top, add a multitop for the return flow to the res.

I only use D5 pumps, very reliable, had mine for years, and variable flow rate adjuster.

Currently have mine set in one of these: https://www.ekwb.com/shop/ek-xres-140-revo-d5-pwm-incl-pump but using a miltiport top for the return flow.

 
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Solution
Thanks for the help, I just assumed that pumps sucked and pushed, having the second pump in the loop pushing to another res would definitely be pointless then.

I think my best option for the best performance is to run a seperate loop for each GPU like coozie suggested
 
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That is a great suggestion to be honest.
 
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Seanie, if worse came to worse is a single D5 pump enough to push through two 480 rads and two blocks while still maintaining low temps?

I would be pushing both gpus (1080 TI's) to their absolute limits and anything above 60C under full load would be unacceptable
 
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To give you an idea, I am using a D5 at power level 3, fastest is level 5, to push the water through 2 x 360mm rads first then into an EK CPU waterblock with a high pressure plate and then back to the res, so I think you should be fine, my temps dont go over 58oC on my CPU under linX, IBT or Prime95 Full stress.
 
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A single D5 will easily drive two GPU blocks and 480 rads.
I'm running a GTX1080/i7 6700 off a single Phobya DC12-400 pump (1530 RPM out of a max of <>2000) with a Black Ice Nemisis 420 rad, cooled with just 3 Noctua 140mm fans-running sub 1000 RPM-and the 1080 has yet to break 54C. None of this is overclocked, I'm too lazy to bother these days 😉 but even with a hefty OC dual 480 rads and one D5 will keep those GPUs really frosty.
Note, if you're using thick (over 35MM) rads, or rads with a high fin density, be sure to use high static pressure fans-they're usually denoted with 'SP' somewhere in the part code-high airflow fans (usually denoted 'AF') won't drive cool air through a thick rad as effectively.
 
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Coozie, at this moment I'm planning on getting 40mm think rads, and using Riing Plus RGB fans which while they are classed as high static pressure fans, the pressure is only around 1.5mmh2o, which isn't the highest pressure fan out there, do you think these fans would be adequate enough for a 40mm thick rad?

The rads are EK coolstream PE 480 rads with an FPI of 38 or 19 split.
 
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This is my rig here: http://imgur.com/oL8pnNn

Im using quite slim rads, with Thermaltake Riing RGB fans 120mm, push/pull on the front one, and just push on the top one, I cant justify paying £100 for the plus version for 3 fans, that would be £300 for fans alone, I was using Noctua NF-F12 fans in my last build, but the 70's appliance look got a bit boring and not a great look for a tempered glass case.

2 x 360s is a bit overkill for just the CPU, but im getting it ready to just add the GPU into the loop at a later date, as I didnt get a reference card though, I would have to slightly modify the EK full cover block to fit it.
 
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For clarification - Radiators are some of the lowest restriction components in a loop. Even if you have a 'large radiator' there is very low restriction. You would really only need 1 pump for this, even with a dual card loop. Also, why 2 radiators for the GPU loop? Depending on what cards are being used, you need to account for loop TDP, not just assigning large rads just because you want to, unless that's just what is being done. There is a point of diminishing return when it comes to excessive radiators.

Also, pumps both suck and push by design - you have to be able to pull water in the pump intake (suck) in order to push it out the outlet. Think of a rope on a pulley - if you pull the rope at any point, you're also pushing it. It is both occurring in the same loop at the same time. This is why there isn't really a concept of a pump pushing or pulling water through a loop - it is doing both concurrently.
 
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