Im complete noob at this subject, but just wodering if i could build slient watercooling loop as an experiement.
Guys, i need your opinions!
Well since you need fans to cool the liquid inside the radiator.
I would say nope, at least not when you mean totally silent.
Depends on your definition of silent and use case for the machine but generally yes a custom loop can be very quiet if designed right.
Pump and fans will make noise, you might be able to nix fans (Depending on thermal load/ rads / ambient temps etc) but pump will always be needed.
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How about running the pump at low rpm? Is this even possible? My defenition of slient is that i could not hear my system while wearing closedback headphones
Pretty much a guarantee assuming you dont severely undersize rad
But if i do put overkill rads on that would put the pump rpm down as well the fan rpm?
What are you trying to cool and how much rad space do you have ability to fit in your case of choice?
https://www.ekwb.com/blog/which-pump-should-you-use-d5-or-ddc/
some good basics on rad and pumps D5 is generally quieter I have used both tho and with closed back headset you wont notice a difference. DDC generally gets loud only on the higher end of the rpms D5 is pretty quiet even on its top end I have found with the ones I have used.
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Nothing with moving parts is ever truly silent. But it can be really really quiet.
If you have the option, you could mount the pump, radiator and fans on the other side of the wall your computer sits next to.
Like Josh from NFC did in this video:
Or you could go full Linus and put your computer in another room, and run cables over to you desk.
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There are passive radiators, so you would be down to only pump noise.
Alphacool Cape Cora for example:
Decoupling the pump might get difficult. Connecting it with soft tubes and isolation dampers should help with that.
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If you go really overboard with the cooling capacity yes, it can be silent*. The only thing you can’t control are pitches of the sound of different components in the system (a whiny GPU or pump for example). I guess to lower the RPMs you could use two pumps in the system if you pick 60mm thick radiators.
*equal to or below the noise floor of where the PC is
P.S. big reservoirs help cooling because of the extra thermal mass guaranteed by more water.
I would not expect pump RPM in a passive setup to affect temperatures in a meaningful manner.
Instead of using typical radiators, I would strongly recommend to get ones designed for passive operation.
What about Large rads, with Large fans, running slow? Not silent, but might move the inevitable heat saturation of pure passive down the road?
What hardware are we talking about?
And what headphones? 
Good point.
A 200GE and HD 280Pros, you won’t even hear the stock heatsink.
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Under those cans, you you’r not gonna hear shit regardless. xD
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i5 9500 and gtx 1070
And yes i know my components are bad for custom loop, going to upgrade 9700k and rtx 2070 super/ rtx 2080 at some point
My case is currently Fractal Desing Define C
And we are talking about sennheiser gsp 600 headphones
I don’t think you need watercooling for that. … Actually I know that.
There is another thread currently with a custom air cooled Fury X which is putting out more heat than a 2070 super / 2080. And I have used the same air cooler of that topic. It is the Raijintek Morpheus II. You strap that on and a pair of noctua fans and the card is very quiet.
Basically the same is true for the CPU as well, a NH-U14S in push pull with a second fan removes as much heat as a 240 AIO, easily.
As long as you have proper airflow in your case, those components should stay very quiet even on air. With closed back headphones you should not be able to hear that system.
Oh, one more thing I should have asked earlier: Where is that system positioned? Right next to your head or under the desk or … ?
Yes only thing in my custom loop was a pump only thing that could make noise was effectively silent.
And I was bullshiting too many rads way too open of a build. And I needed a anticorrosion fluid additive