Groo (charlie.delete@this.semiaccurate.com) on August 14, 2019 7:19 am wrote:
> 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

Zalman does seem to have switched to large slow fans, from the old Reserator system.

https://www.quietpc.com/reserator1-v2

http://zalman.com/na/contents/products/list.html?c=100050

Industrial computers in dirty environments have to be fan-less, lots of those are available with modern CPU’s:

https://www.logicsupply.com/computers/industrial/fanless/?cpsrc=Search_Beta&agname=&kw=%2Bfanless%20%2Bcomputer&ps=1o3&gclid=Cj0KCQjw4s7qBRCzARIsAImcAxYrkvnIJANL3NfRg1XmbqUuDP4R-c-S9Fo2WcidxnNz2Y2UCmKKjfwaAuyOEALw_wcB