How to install a psu? Fan side up or down?

[JEDI]

i bought a 500w psu. there's a fan on the back, and a fan on the top (or bottom, depending on how u lokk at it).

do i install the psu w/the fan on top or on the bottom?

thx

 

[JZilla]

Unless you have a hole in your case or this is some sort of special psu: Bottom. This way one fan sucks air into the psu, while the other spits it out. Or that's how it's supposed to work anyway on most dual fan psus.

 

[Jeff7]

The holes in the PSU should only correspond only one way with the holes on the case. Installing it upside down would result in only 3 screws being able to go through, instead of all 4.

 

[MichaelD]

The second fan faces down, right over the CPU. It's designed to vent hot air from the case and works quite well.