Like Apples monitor that also has a fan?

But Apple's fans are made from recicled SR-71 blackbirds to ensure ultimate noise suppression and each fan blade is assembled by a Swiss watchmaker to ensure quality.

Just kidding, it comes from the same Chinese factory as every other fan but Apple's fans(pun intended) like to believe in magic to justify the price tag.

Yes, I wonder too why is is necessary, especially because my PC is completely fan-less :-/

However, over the day is is barely audible and it only comes to my mind when I am sitting in front of the PC late at night (+ without headphones).

I think the fan is for the G-Sync module!