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Question in regards to reducing pump speed

post #1 of 9
Thread Starter 
I currently have a Laing DDC 18w pump which is connected to the psu by a 3 pin to molex adapter. At the moment it's running at 100% but can I reduce the speed by using a Noctua RC6 adapter between the pump and molex adapter or do I have to get a fan controller?
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Buff Hamster
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post #2 of 9
I'm pretty sure the little resistors they send with fans would be able to fry bacon if you run pump amperage through them.

You get 5v, 7v, and 12v directly from the PSU; are none of those to your taste? You just have to re-arrange the molex wires.
post #3 of 9
Thread Starter 
How do you get different voltages directly from the psu? Please teach me as 7v would be nice for the pump.thumb.gif
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post #4 of 9
post #5 of 9
Have you tested that with an 18W pump that can draw multiples of that on spin up? It's not a little cooling fan.

I'm just wondering why no PSU crosses the rails to offer 7v and why no pre-made molex adapters have been available that do that and instead a 7v fan adapter will use a resistor.
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post #6 of 9
Thread Starter 
[quote name="Electrocutor" url="/t/1414337/question-in-regards-to-reducing-pump-speed#post_20511998"http://www.techpowerup.com/articles/other/137[/quote]

Thanks for the link

+rep
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post #7 of 9
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[quote name="Electrocutor" url="/t/1414337/question-in-regards-to-reducing-pump-speed#post_20511998"http://www.techpowerup.com/articles/other/137[/quote]

Thanks for the link

+rep
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post #8 of 9
I don't think a DDC3.2 will generally start w/ less than 9V.
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post #9 of 9
Quote:
Originally Posted by Darren9 View Post

Have you tested that with an 18W pump that can draw multiples of that on spin up? It's not a little cooling fan.

I'm just wondering why no PSU crosses the rails to offer 7v and why no pre-made molex adapters have been available that do that and instead a 7v fan adapter will use a resistor.

I know that 12v and 5v can't possibly be an issue. I don't have an oscilloscope to see for certain whether the 7 volt mod has any negative effects. Given the complexity of some of the protection circuits and what not in newer power supplies, it is possible to cause problems. I personally just run the 5v rail for all of my fans.

[Edit]
Looking at the various DDC pumps, the lowest starting voltage I see is 8v, so you'd be better off using a rheostat to be sure you have ample voltage at startup, and can then tune it down a little afterward.
Edited by Electrocutor - 7/30/13 at 10:20pm
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