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dual pump question

post #1 of 16
Thread Starter 
I was curious as to how you set up a dual pump loop, not two separate loops but one loop with two pumps. Do you put them right next to each other or do you put one halfway through the loop or can you do either.

Edit: I need this because I have alot of blocks and want better flow
Edited by fenderlove0` - 5/15/11 at 2:16pm
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post #2 of 16
Quote:
Originally Posted by fenderlove0`;13516207 
I was curious as to how you set up a dual pump loop, not two separate loops but one loop with two pumps. Do you put them right next to each other or do you put one halfway through the loop or can you do either.

50% of loop > pump > remaining 50% of loop > repeat

the whole idea of a dual pump is to balance the load and pressure throughout the loop, not to have one high-force setup pushing through the entire loop.
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post #3 of 16
When I do dual pump, I like to put them in series, in case one fails.

Splitting the pumps IMO is kinda worthless. It increases your flowrate. It has been proven that increasing flowrate does almost nothing to temperature performance. In my eyes, dual pumps is for redundancy, not performance.
 
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post #4 of 16
you can do either, you just want them to be the same pumps.

there are several companies that make dual pump pump tops.
post #5 of 16
Quote:
Originally Posted by TitaniumClocker;13516240 
When I do dual pump, I like to put them in series, in case one fails.

I think he wants support for a large loop, rather than redundancy.
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post #6 of 16
Quote:
Originally Posted by railfan844;13516254 
I think he wants support for a large loop, rather than redundancy.

See my edited post

There's no performance point to getting a second pump. It will not help thermal performance by a significant number. I'm talking a couple tenths of a degree.
 
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post #7 of 16
Quote:
Originally Posted by TitaniumClocker;13516279 
See my edited post

There's no performance point to getting a second pump. It will not help thermal performance by a significant number. I'm talking a couple tenths of a degree.

well I was thinking if you're pushing coolant up a large elevation change, you would want one at the bottom and one at the top. but that's kind of irrelevant, still I would want them split to keep the pressure from gravity more evened out (if that's possible)
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post #8 of 16
Quote:
Originally Posted by railfan844;13516320 
well I was thinking if you're pushing coolant up a large elevation change, you would want one at the bottom and one at the top. but that's kind of irrelevant, still I would want them split to keep the pressure from gravity more evened out (if that's possible)

Ask yourself this... what is the real goal of doing that?

Maintaining flowrates? making sure the pumps have enough total head? a D5/MCP655 has 11 feet of head. Unless youre going even half that height, you have nothing to worry about in terms of moving water through two CPU blocks 3 GPU blocks and hell, even some RAM blocks. One good pump can handle it. Adding a second pump to the same loop will do virtually nothing.

Now if you wanted to split the loops and have a CPU on one pump and the GPU's on another, that would indeed net a thermal performance gain.

two pumps in the same loop is pretty worthless for performance.
 
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post #9 of 16
Quote:
Originally Posted by TitaniumClocker;13516367 
two pumps in the same loop is pretty worthless for performance.

I have seen tests that show both ways. some claim big gains, some claim no difference. there is definitely no harm in doing it though so long as you use two of the same pumps, so I say go for it. I would personally run them at different places in the loop if it was my rig, but it should not matter a whole lot.
post #10 of 16
Quote:
Originally Posted by railfan844;13516238 
50% of loop > pump > remaining 50% of loop > repeat

the whole idea of a dual pump is to balance the load and pressure throughout the loop, not to have one high-force setup pushing through the entire loop.

Would you actually see a difference? Because the pumps are pumping an incompressible liquid, the pressure is carried all the way around the loop anyway.

And the pressure drop across any one piece of equipment will be the same for a given flowrate, so splitting them up or separating them... you wont see a change imo.


What you need to know about pumps is; if you put them in series you double the max pressure, if you put them in parallel you double the max flowrate. If you plot a flow/pressure diagram and then plot a flow/pressure drop curve on it you can work out what your flowrate will be for a given loop and pump combination.

Such a diagram would look something like this:

seriesvsparallel2.png

From MartinM210


The basic idea of dual pumps beyond redundancy is, if your flowrate is below about 1 GPM, you don't have enough flow to achieve turbulent flow in key points, which ruins the heat transfer ability of the water due to a lack of flow next to the surface of the heat sinks.

Edit:

Pls ask if this needs explaining further.
    
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