First I would like to say that I am missing a forum index on watercooling. I think it would deserve its own index on the main page as with watercooling it is easier to build a totally silent system then with the usual fan aircooling. Altho not everybody might agree with me
Also I see less information on the forum and site about watercooling then I would expect.
Okay on topic:
I just found out that Innovatek which makes many parts for watercooling also has passive radiators !
This can be simply mounted on the side of your case like shown on
which eliminates the need for having fans on your radiator/CPU which helps to make a very quiet setup. Or even a totally fanless computer in a more complex setup. I also have a (much larger) passive radiator on the side of my case but I custom made that one myself about half a year ago.