How loud is your D5 PWM pump?

[Goose]

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.

Thanks

 

[Goose]

After building and bleeding my loop I found my Alphacool VPP755 (D5 Vario plus PWM input for stepped control) was audible in the higher region of its range. Only, say, as loud as a 7200RPM hard drive. Unfortunately I've stopped using spinning disk drives as the noise annoys me, so I considered the pump too loud.

Bear in mind this is firmly mounted to a radiator so vibrations carry into the chassis quite well. It's really the chassis making noise with this sort of vibration. You could try soft mountings.

I'm tempted to go back and sound test my pump again. TBF I tested it previously with all fans unplugged.

The picture below shows how i've mounted my pump/res, it's the only logical place for it imho. Please ignore the loop order nonsense, its an old picture.

Spoiler: Pump/res

It's quite thin metal that it's mounted to which probably doesn't help. Would you be able to advise me on how to soft mount it?

Thanks

 

[Goose]

Thanks for the info.

I've order a 'Shoggy' Sandwich (great name!) to isolate the pump/res from the chassis. Just have to wait and see how effective it is.