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Is it sensible to run two pumps in a loop?
- Thread starter Gepetto
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Soldato
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Pumps in series add pressure, which can help to overcome restrictive loops or very long runs. In parallel they add up for more flow instead.
It can also help as you have redundancy if a pump fails. What's your actual goal though?
It can also help as you have redundancy if a pump fails. What's your actual goal though?
Hi, the idea would be for redundancy more than anything else.
Soldato
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Yeah can do it
Done it loads of times for redundancy
Tried with a d5 and a ddc
And with 2 x d5
Had no issues with either setup
And tested both by disconnecting each pump
To simulate a pump failure
As no point doing it
But not actually testing if the redundancy works
In the event one fails
Done it loads of times for redundancy
Tried with a d5 and a ddc
And with 2 x d5
Had no issues with either setup
And tested both by disconnecting each pump
To simulate a pump failure
As no point doing it
But not actually testing if the redundancy works
In the event one fails
Thanks for the suggestion. Separate loops would not give me the redundancy I'm looking for, although parallel would work.
I'm now thinking about the resistance in the blocks, as the flow may be restricted more by the CPU block than the GPU block, and then the question of separate loops raises its head again.
I'm currently waiting on a pre-order PSU to give me more headroom, and when that arrives I'll put it all together. The loop thoughts are currently to go with the pumps in series.
Soldato
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You don't need to run your blocks parallel, to run pumps in parallel. You could have:
2 pumps in parallel >
Radiator >
Graphics card block >
CPU block >
Radiator >
Reservoir >
Pumps
Or similar.
Cheers. I was actually running the CPU block before the GPU block. Should I re-think that?
Soldato
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Series would generate higher pressure to overcome the restictions. D5s would have enough flow anyway.
Soldato
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Nope, you're definitely overthinking it for 2025
A few things that seem to be commonly accepted now water cooling is thoroughly established:
A standard DDC or D5 pump is enough for your average 1 CPU, 1 GPU, internal radiators loop.
Order of components does not matter, within a degree or so. The liquid flows too fast to "soak" heat from one component and dump it in another.
Resistance of blocks isn't crazy now, so you don't need to stress about parallel/separate loops or anything like that.
It pretty much will all "just work" so long as you have enough radiator space!
*Overthinking and planning is of course half the fun of this hobby so don't feel judged or discouraged
Nope, you're definitely overthinking it for 2025
A few things that seem to be commonly accepted now water cooling is thoroughly established:
A standard DDC or D5 pump is enough for your average 1 CPU, 1 GPU, internal radiators loop.
Order of components does not matter, within a degree or so. The liquid flows too fast to "soak" heat from one component and dump it in another.
Resistance of blocks isn't crazy now, so you don't need to stress about parallel/separate loops or anything like that.
It pretty much will all "just work" so long as you have enough radiator space!
*Overthinking and planning is of course half the fun of this hobby so don't feel judged or discouraged
Brilliant! Thanks @LuckyBenski
Another thing to keep an eye out is coolant flow and temperature source signal. You wwant coolant flow to be between 0.5 and 1gpm (gallon per minute) when the pump is running at max RPM.
If you don't get that then you either got a restrictive component (not really a case with reputable brands nowadays, just don't buy noname waterblocks), or you need mroe head pressure (aka more pumps in series).
As for the temperature source signal, you want to run your loop off coolant temperature and not GPU or CPU temperature.
I suggest buying 2 accurate temperature measuring devices (could be just an inline thermocouple) and fitting them both on your loop. Use one only to measure coolant temperature, and the other one for redundancy if the first one fails.
If you don't get that then you either got a restrictive component (not really a case with reputable brands nowadays, just don't buy noname waterblocks), or you need mroe head pressure (aka more pumps in series).
As for the temperature source signal, you want to run your loop off coolant temperature and not GPU or CPU temperature.
I suggest buying 2 accurate temperature measuring devices (could be just an inline thermocouple) and fitting them both on your loop. Use one only to measure coolant temperature, and the other one for redundancy if the first one fails.
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