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Help with loop upgrade!

post #1 of 18
Thread Starter 
I built my first water cooling rig last year and I'm starting to think about upgrading the loop! Currently the loop consists of a tube res., a D5 pump, a radiator, a GPU block and CPU block. I've learned a lot and I want to keep improving so I'm considering the upgrade path.

I definitely want to add a second GPU this year. I'm considering a second radiator as well. Possibly upgrading to a dual loop or a dual pump in serial single loop. Here's a link to my build log where there's a list of gear in the OP or you can see it in my signature.

Let me know what you guys think.. Thanks!
Edited by james41382 - 2/2/16 at 7:43pm
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post #2 of 18
There are very few reasons to run dual loops. Save yourself the un-necessary hassle and do a single loop with two pumps in series. Honestly, with just 3 blocks and 2 rads, 1 D5 will do the job.
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post #3 of 18
Thread Starter 
Quote:
Originally Posted by WizardontheJob View Post

There are very few reasons to run dual loops. Save yourself the un-necessary hassle and do a single loop with two pumps in series. Honestly, with just 3 blocks and 2 rads, 1 D5 will do the job.

Thanks for the reply. My reason for considering a dual loop is to separate the GPUs from the CPU.
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post #4 of 18
But why?
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post #5 of 18
Dual loops waste radiator effectiveness. CPU intensive tasks are not cooled by GPU rad; GPU intensive tasks are not cooled by CPU rad. Dual loops may be necessary sometimes. But if you don't need dual loops, why get one? It's certainly a valid choice if you want it.
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post #6 of 18
Thread Starter 
Quote:
Originally Posted by WizardontheJob View Post

But why?

So the heat from the loop with the CPU doesn't increase the temp of the heat in the GPUs loop. My CPU runs much hotter than the GPU.
Quote:
Originally Posted by essanbee View Post

Dual loops waste radiator effectiveness. CPU intensive tasks are not cooled by GPU rad; GPU intensive tasks are not cooled by CPU rad. Dual loops may be necessary sometimes. But if you don't need dual loops, why get one? It's certainly a valid choice if you want it.

I have a large case so aesthetics are part of it. I feel like I need to fill in the space. What about if I wanted to add a third GPU and radiator next year? Would the second loop be warranted in that case?
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post #7 of 18
All I'm saying is that when you split the loops, you are wasting cooling capability. A lot of tasks will load your CPU or GPU, but not always both at the same time. If you have a task that is CPU intensive, none of the cooling of your GPU loop will help. If you had a single loop (CPU and GPU) CPU is cooled by your entire loop. If you want dual loops, go for it, but understand the separate loops lower total rad efficiency.

You can add as much equipment as your case can hold, I just don't like the efficiency loss and extra cost of dual loops. There is nothing inherently wrong with dual loops.
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post #8 of 18
I will just echo everything @Essanbee said. The temperature of your loop raises as a whole across the entire loop. Using every radiator in unison on the same loop will give you more cooling capacity liter for liter than splitting them up.

But if aesthetics is what you are after, by all means go ahead. Just proceed with the knowledge that you are doing so with loss of efficiency and at greater cost.
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post #9 of 18
Thread Starter 
Quote:
Originally Posted by essanbee View Post

All I'm saying is that when you split the loops, you are wasting cooling capability. A lot of tasks will load your CPU or GPU, but not always both at the same time. If you have a task that is CPU intensive, none of the cooling of your GPU loop will help. If you had a single loop (CPU and GPU) CPU is cooled by your entire loop. If you want dual loops, go for it, but understand the separate loops lower total rad efficiency.

You can add as much equipment as your case can hold, I just don't like the efficiency loss and extra cost of dual loops. There is nothing inherently wrong with dual loops.


I understand the point about loss of efficiency. I and it's something I had not thought about before so I'll spend some time considering it.

Quote:
Originally Posted by WizardontheJob View Post

I will just echo everything @Essanbee said. The temperature of your loop raises as a whole across the entire loop. Using every radiator in unison on the same loop will give you more cooling capacity liter for liter than splitting them up.

But if aesthetics is what you are after, by all means go ahead. Just proceed with the knowledge that you are doing so with loss of efficiency and at greater cost.


Let's say you have a loop with 3 rads: 560x80, 480x45, 360x45, 3 GPU blocks and 1 CPU block. Do you think a single D5 could handle that?
Neophyte
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Neophyte
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post #10 of 18
That might be stretching a single D5 too much. Rads are basically very little restriction, but four blocks and your tubing might need that additional D5. There is a way to figure out how restrictive your loop is,but I believe it is more of an accurate estimate than a firm measurement. I would probably double pump a 4 block loop.
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Big Blue
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