Discussion Barrow CPU Pump/Block LTPRPA-04 - any way to make it run slower?

[wywywywy]

Hi all,

So I have a Barrow CPU Pump/Block LTPRPA-04, and the minimum it'd go is ~1850rpm which is still too loud for me (the humming noise). This is at 0% PWM.

I used to have a D5 at around 1500rpm and it was perfect.

Is there any way to make it run slower? I don't regularly need the high flow.

Can I reduce the voltage or have another pot inline without doing any long term damage?

Thanks.

EDIT: The reason is that at idle I have all my fans at around 400rpm, so the only noise I can hear is the pump hum which is a bit annoying.

 

[Arie]

It's PWM-controlled, and 10%/1850RPM is the lowest it will go. I have two of these, one of them initially had a hum at 1800-ish RPM, but when I ran it at 2000RPM it went away. Nowadays the hum at 1800 RPM is gone too.

 

[Gilles3000]

Please disregard.

 

[tinyitx]

The product page says the control is by pwm + manual. And there is a pic showing a manual speed control knob.
What happens when you try to control manually?

 

[wywywywy]

The knob leftmost is PWM. After that it's manual control from ~1850rpm to ~4500rpm.

 

[wywywywy]

Just realised that my board (Asrock B550 Phantom ITX) supports 2A through the fan connector, and the pump should only need 1.5A max.

This in theory should mean that I can use voltage control.

Has anyone tried voltage controlling a DDC pump? Is it going to cause problems?