Jouni Osmala (fname.sname.delete@this.aalto.fi) on August 14, 2019 12:09 am wrote:

> Well quick googling for AIO gurgling, noise seems to be dependent on fine details of how it is installed,
> and for some people it happens 4-5 seconds in a week, and some people for couple of minutes after the
> boot up and many people it just doesn't happen with fully integrated cooler. And pumps have probably
> become quieter as measured numbers of noise oriented liquid cooling systems seems to be below what
> air coolers can get. Anyway I think youtube channel LinusTechTips could get/make an CPU radiator that
> would function as case side panel also and have it air cooled with large low rpm fan.
>
Most liquid coolers, AIO or custom, tend to have a mechanism for trapping/containing air that is in or leaks into the system. Many of these require the system to be active to function properly, think something similar to a vacuum that uses vortexes to separate the dirt from the air before it hits the filter.

When the system gets turned off, the air can migrate back in to places it should not be until the next power up. Once turned on, the system will gurgle an spit until the air is trapped in the 'right' place again. If the device continues to make noise, you likely have too much air in the system for the trap to handle or it is just a bad design. If all of a series make noise, you know which it is.

Also depending on the size, liquid coolers can have loud fans too, the heat has to go somewhere. If you want a quiet system, there are (were?) companies making a 'dimmer' switch for fans that you could manually control the speed with. Haven't seen one for a while but I haven't been looking either, that might be an option for some. Another route is that most modern boards have an API to control the lights and fans, I think Corsair's is open and documented decently but that is just from talking to them, I haven't looked. It probably wouldn't take much to make a script to set the fans where you want with one of those.

-Charlie