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How loud is your D5 pump?

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post #1 of 11 (permalink) Old 04-21-2019, 02:36 AM - Thread Starter
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How loud is your D5 pump?

I was watching a Singularity Computers video and he mentioned that he leaves hid pumps running at 100% at all times because of how quiet they are.

I've just completed my first ever loop and my D5 PWM (EK 140 pump/res combo) is anything but quiet at 100%. Even 50% is audible to me. I'm wondering what other people have experienced with their D5s?

Regarding the noise i do have one concern. When filling the loop i didn't realise that when turning my PSU off the pump didn't stop instantly and I think it sucked in air for a second or two. I'm aware that pumps should never be run dry and i'm wondering how to tell if a pump has suffered damaged?

My last noob question is about powering the D5. My EK one has a molex and a 4pin, should both be used together or is it meant to be one or the other? I'm currently running it with both connected and i can still make use of the PWM.

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post #2 of 11 (permalink) Old 04-21-2019, 05:12 AM
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My D5 (also the EK 140 pump/res combo) on the 7980XE rig is totally silent. I leave it at 100% and can only hear it if I turn all my fans off and have the case side off. I have it soft mounted, so maybe that is why it is quieter.

Running air through a pump for a few seconds won't hurt it

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post #3 of 11 (permalink) Old 04-21-2019, 05:30 AM
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mine has been completely silent.

Mine was with an XSPC photon 240 v2 ( sata connection)

even on low fan speeds i absolutely cannot hear the thing

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post #4 of 11 (permalink) Old 04-21-2019, 05:45 AM
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Depending on your loop's complexity. If it's free from any restrictions, D5 is very silent but as you add fittings and other components D5 has to overcome the pressure and staring to make level of noise. Mine has to go through ton of fittings and flow sensors blocks and I also have huge case so I hear some noise but not much, you can tweak the pump to your liking via voltage control.

Mine its It's fairly quiet at 2200RPM and slightly lover and higher but at lower then 1900RPM and above 3000 RPM is pretty loud. It's the complexity of your loop that dictates how quiet or loud your D5 will be but generally D5 is very quiet pump.

Last edited by NewUser16; 04-21-2019 at 05:49 AM.
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post #5 of 11 (permalink) Old 04-21-2019, 05:52 AM
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Hi,
Yep if a d5 is making noise most like cause is mounting without rubber or plastic washers or feet
Or something is clogged cpu block.... this is the only time I've ever heard one of my d5 which both systems have two ek d5 pwm pumps in them neither make any noise.

As far as the two wires molex is how the pump gets power
pwm plug gives you the ability to see rmp feedback and adjust rpm rate so yeah stick with using both
Not using the pwm will make the d5 run at 100% all the time usually only good for filling the loop.

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post #6 of 11 (permalink) Old 04-21-2019, 11:46 AM
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D5 pumps aren’t loud by any means unless something is jammed in it or the impeller is out of balance. You can hear the pump running, but nothing loud by any means. You’ll get more noise from a DDC pump than a D5 all day long.


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post #7 of 11 (permalink) Old 05-06-2019, 01:06 PM
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I'm in the same boat as you. My D5 is pretty loud at 100%, and still very audible at 50%. It's not until I get down to around 35% that it gets almost silent. This isn't a problem for me because it does its job well at low PWM settings. It stays below 50% most of the time even during gaming. I only turn it up to get air out of my loop.

I don't think that my loop is particularly restrictive but maybe it is. I've got one universal GPU block, one CPU block, one 420mm radiatior and obviously some fittings. The pump is in a monsoon MMRS reservoir mount.
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post #8 of 11 (permalink) Old 05-06-2019, 01:24 PM
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How loud is your D5 pump?

Quote: Originally Posted by ThrashZone View Post
Hi,

Not using the pwm will make the d5 run at 100% all the time usually only good for filling the loop.


Actually, unless you have a newer D5 pump, the earlier PWM D5 pumps run at about 50%-60% with no PWM signal (not connected). You have to send 5v to the pin 4 on the PWM connector to get 100% (Usually only done to get the pump running for bleeding air and filling, but I have used 12v with no issue, lol) I have three D5s like this and one newer ones that runs 100% with no PWM signal.


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post #9 of 11 (permalink) Old 05-06-2019, 01:39 PM
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Mine are the loudest thing in my system but still very quiet. Those that say silent must have a seemingly loud office, idk. But they're still the quietest pumps I've ever used in a PC.

If air gets in them then they're annoying but once bled they are pretty good, even better if you decouple them from the chassis

Power via molex the 4 pin is mostly for PWM control and/or RPM monitoring (depends what you have)

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post #10 of 11 (permalink) Old 05-06-2019, 02:36 PM
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Buiy last week Watercool D5 Vario, its at speed 2, no noise or vibrations.

Use flex tube 10mm and only a Heatkiller IV WB, so not much strain here.

Din`t try yet full speed......
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