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Questions on Adding Second Pump

post #1 of 11
Thread Starter 
My current loop is very basic - CPU & chipset blocks, 2 - 120mm rads, 5.25 bay res, and DD-CPX Pro pump. The pump has a max flow rate of 800L per hour & its more than strong enough for current setup.

With my next expansion I'm looking to add 2 GPU blocks, 2 - 240mm rads, and a 250ml cylinder res - all in addition to what I currently have. Just looking at that, I'm thinking this new setup might need a second pump.

So first question is simply this - will I need a second pump to help with all that new hardware?? If so, does the second pump need to match the flow rate on first pump, or is that important??

Thank You.
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post #2 of 11
you could always just get one good pump?

But yes it is important that both pumps are the same when using 2 in one loop
post #3 of 11
I don't think adding another pump will have the desired effect:

Adding a second pump wont increase the flow rate if you add it in series with your current pump, what you will do on the other hand is double your operating pressure, which, considering you have enough drive from one pump to go around the whole loop wont do much at all.

you would have to add it in parallel with your other pump to see a difference in flowrate, and considering that any given water molecule will spend the same time in the radiator and CPU block at any flowrate, I don't think you'll see that much of an increase from that either.

What you would probably see the biggest gain in, is running two loops.
    
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post #4 of 11
Quote:
Originally Posted by amgsport View Post
So first question is simply this - will I need a second pump to help with all that new hardware??
Just buy a 355 + xspc top and that'll take care of your loop. Sell the other pump to help pay for the new pump.
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post #5 of 11
Quote:
Originally Posted by mhaneline View Post
Just buy a 355 + xspc top and that'll take care of your loop. Sell the other pump to help pay for the new pump.
This. Dual pumps are very troublesome unless you have a dual pump top and even then the added heatdump can slightly hurt your temperatures.
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post #6 of 11
I have a XSPC dual bay DDC reservoir and a MCP355 pump that is only 6 months old I am trying to sell... if your interested email me at bradwehrli@gmail.com
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post #7 of 11
Thread Starter 
Thanks for all the replys. Please help me with something, as I must not be too sharp on these things....

The MCP355 specs show a "nominal" flow rate of 454LPH - so I'm assuming since that's a "nominal" spec its likely to increase a bit at max flow.

The CPX-Pro specs 800LPH max flow. While I understand differences in manufacturers, etc, and I have nothing but respect for Laing/Swiftech, isn't 800LPH stronger than 454LPH - or whatever increase the 355 attains at max flow?

Apologies for the stupid question, but it seems a legit question. I researched flow rates before ordering & got the CPX-Pro specifically for the higher flow rate. Did I make a mistake with that???
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post #8 of 11
Those statistics are useless, they only represent the flow rate of the pump when it isn't pushing through anything. What you really want to focus on is the pump's head pressure at 1.0 GPM.

CPX-Pro: 3.83 PSI
355 + XSPC Res Top: 6.40 PSI
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post #9 of 11
Quote:
Originally Posted by charliehorse55 View Post
Those statistics are useless, they only represent the flow rate of the pump when it isn't pushing through anything. What you really want to focus on is the pump's head pressure at 1.0 GPM.

CPX-Pro: 3.83 PSI
355 + XSPC Res Top: 6.40 PSI
Nice info!

I hadn't thought about it before, but is there a site that compares the flowrate/pressure graphs produced by pumps?
    
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post #10 of 11
Quote:
Originally Posted by Crabid View Post
Nice info!

I hadn't thought about it before, but is there a site that compares the flowrate/pressure graphs produced by pumps?
Different websites for different graphs. Whenever I quote pump pressure data I use Martin's MCP355 and MCP350 pump top testing, and for the 655 and the Jingway pump series (DD, EK and OCZ Rebrand these pumps) tests from Skinnee Labs.

Always look for the pressure data at 1.0 GPM, as that is the point where most temperature gains become minimal.
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