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Two pumps, one loop?

post #1 of 13
Thread Starter 
I've got a spare replacement pump for my setup when I first built it, and now I have some gpu-blocks (maze5) and a new case in the mail, so I'm going to be setting things back up again. I'm trying to work out the best configuration.

The simplest would obviously be (which I will probably end up doing)

pump->rad->cpu->gpu->gpu,

but I'm trying to figure if it would work to have (if you can follow, not sure I do...),

pump1+pump2 joined into Yjoint->rad->split Yjoint into CPU/GPUs->pump1,pump2 respectively.

I'm sure there's a glaring flaw in my plan that I'm not seeing or understanding (not sure if pump pressure mulitpies or divides as ideally as I picture it). But I'm worried that in the first simple scenario the second GPU will be getting hit with the all dumped heat from earlier in the loop.

I'd like to keep things in one loop if possible, and want to put my other pump to use since it's just collecting dust atm. I realize a two loop solution is best here, but trying to brainstorm something that would help me not have to buy a new radiator

Any thoughts on my hair-brained scheme?
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post #2 of 13
why not have the second pump between the CPU and GPU?
post #3 of 13
Are the two pumps identical? If so, use them in series for maximum flow. Placing them in parallel increase pressure more than flow.... which is not needed unless you have an uber restrictive loop.
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post #4 of 13
With one pump stronger than the other you want to make sure you put the stronger one first and then the other one a bit later in the loop, but not too close to the inlet of the first one.

I even confused myself with that one....

Ok, say you put the pumps directly after each other, the strong one first and the weak one second. The weak one will end up doing the opposite of what you want it to do and will actually be resisting the water flow. Do it the other way around - the weak one first and the strong one second - and you either get the same result as only having the strong one or you end up burning it really quickly because there isn't enough water, depending on the way its made.

What you need to do is take your entire setup out and try installing the weaker pump at different positions in the loop. Your goal is to place it at the point where the flow has been restricted enough (after going through tubing and blocks and stuff) that it is slower than what the pump pushes out. Otherwise, of course, it wouldn't be worth it in the first place. Maybe a flow meter would help you here.


But of course, if the pumps are exactly the same, you can do pretty much anything without worrying.
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post #5 of 13
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
Are the two pumps identical? If so, use them in series for maximum flow. Placing them in parallel increase pressure more than flow.... which is not needed unless you have an uber restrictive loop.
Yup, two D5's. Other than the fact that one has some use on it (about a year) their identical.

It is pressure, however, that I'm concerned about. I'm trying to split the line out of the radiator to go into the CPU, GPU(x2) seperately (in parallel rather than in series), then join back together and get pumped back into the radiator.

Am I being way too concerned about the cpu heat effecting the gpu cooling?
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post #6 of 13
Quote:
Originally Posted by dharmaBum View Post
Yup, two D5's. Other than the fact that one has some use on it (about a year) their identical.

It is pressure, however, that I'm concerned about. I'm trying to split the line out of the radiator to go into the CPU, GPU(x2) seperately (in parallel rather than in series), then join back together and get pumped back into the radiator.

Am I being way too concerned about the cpu heat effecting the gpu cooling?
Well, if you are sharing the same rad and res you will end up with exactly the same temps as before anyway. Maybe 1-2 degrees different.
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post #7 of 13
Quote:
Originally Posted by dharmaBum View Post
Yup, two D5's. Other than the fact that one has some use on it (about a year) their identical.

It is pressure, however, that I'm concerned about. I'm trying to split the line out of the radiator to go into the CPU, GPU(x2) seperately (in parallel rather than in series), then join back together and get pumped back into the radiator.

Am I being way too concerned about the cpu heat effecting the gpu cooling?
You are worrying about CPU heat too much. IF you split it, you may end up with worse performance on either the CPU or GPU. Whatever is more restrictive will end up getting less flow.
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post #8 of 13
u could do 2 pumps on 1 loop. It wouldnt be the greatest Idea unless you have a Huge like 10 foot slope on your loop lol. Anyway Why not just have 2 rad's on one loop. I dont know if there would be much of an advantage. I think that If you move the water to fast through the block it wont really give it time to grab heat or cool it.
post #9 of 13
Like the above have said, you will just be increasing the pressure in tubes and not the flow if you do the loop the way you have listed. That is unless you are switching to bigger tubbing and such which I would doubt since you would need new blocks I believe. Then you could use the two small pumps to simulate the larger pump while collecting the two into the larger tubing through the Y joints. You could test out having one pump go to the CPU only and one to the two GPUs while having the Y joints collect to the radiator and separate from the radiator to the two pumps and see if that makes a difference. That type of setup would benefit from a larger flow radiator I would think.
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
You are worrying about CPU heat too much. IF you split it, you may end up with worse performance on either the CPU or GPU. Whatever is more restrictive will end up getting less flow.
Ahhh, I should have realized that. Lot of good that circuits class did me Good call.

Returning to basics then, would putting a second pump in (say, after the CPU as was earlier suggested) be beneficial or not worth the trouble/wattage?
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