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post #11 of 16
there are also pump tops you can get that combine pumps together.
like this.
http://www.xs-pc.com/products/laing-pump-top-reservoir/dual-acrylic-top-for-laing-ddc/
post #12 of 16
I can confirm a single 18W Laing DDC/Swiftech MCP355 is plenty for normal loop. My loop has three waterblocks and two radiators, one MCP355 is plenty, I have loads of flow that can be seen in my reservoir. I run two 355's mainly for the redundancy.
post #13 of 16
Thread Starter 
Quote:
Originally Posted by Crabid View Post
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:



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.
+1 so what do I need? max flow rate or pressure? I am adding another block, a full cover for my mobo and I already have two gpu blocks, cpu block, and 2 rads.
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post #14 of 16
Quote:
Originally Posted by fenderlove0` View Post
+1 so what do I need? max flow rate or pressure? I am adding another block, a full cover for my mobo and I already have two gpu blocks, cpu block, and 2 rads.
You want the pumps in series, There are virtually no situations in PC water cooling where parallel pumps would be preferable, or even remotely desirable.
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post #15 of 16
Another problem associated with having two pumps in parallel configuration is what happens in the event of one pump failing. Basically the water will flow backwards through the stopped pump, greatly reducing your loop flow.

Martin recently did some testing showing just this.

If you are going dual pumps, series is the way to go.
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post #16 of 16
Yup, as people have said, you want them in series, if you follow the orange line on the graph, that's an example restriction curve for a high restriction system like you have.

Then if you use that to get the flowrate for a given pump you can see that because the pressure requirement is so high, adding a pump in parallel doesn't move the flow at all, but having it in series increases it by around 50%.


Parallel pumping only really becomes viable when you have a very low restriction system.
    
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