Paper was 2009 in Parma
Fernando Lopez-Lezcano: The Quest for Noiseless Computers
http://lac.linuxaudio.org/2009/cdm/Friday/14_LopezLezcano/index.html

That page has links to text (pdf) and a video of the presentation

Quoting jpff@cs.bath.ac.uk:

> I built a quiet quadcore amd machine some time back.  The main  
> features are a quiet power supply (essential) and no fans in the  
> case. For more quiet one needs to take care of disks as well.
>
> There is a paper in Linux Audio Conference (Cologne I think?) about  
> building really quiet machines at CCRMA using external water  
> cooling.  I will look it up if someone does not get there before me
>
> ==John ff