What?
Useless?
Just put 1 or 2 $10 USB 120mm silent fans atop the chassis of the X3400 and it runs extremely cool after 6 hours of loud karaoke!
I actually prefer to use my own external fans. They are very efficient, silent, and economical - I can easily replace the fans if I need to for $10 each.
Now, I do agree that I would not recommend using the X3400 without these $10 silent 120mm fans!
That's one of the best advices for anyone coming to this forum! Use 120mm silent fans on all your electronics that heat up.