The fan that came with my Intel Core II Duo when I built a good while ago is definitely the loudest thing in my box.

Quiet a statement considering I have a 10" fan built into a side panel. It performs nicely though. Especially now that it is using the full amount of 8GB of RAM that I salvaged from my Uncle's 'tossed aside' PC, thanks to Windows 7's 64 bit mode that actually works with things.

With great power comes Awesome irresponsibility.