Up or Down?

[Luhan]

What exactly are the difference when you put your psu up or down?

[79wjd]

What exactly are the difference when you put your psu up or down?

Assuming the case has vent holes on the bottom (assuming the psu mount is on the bottom), then putting the fan down allows the psu to take in its own fresh air and exhaust its own hot air. Putting the fan up allows it to take in the warm air inside the case, and exhaust it (essentially it becomes a shitty case/exhaust fan). 

[thekeemo]

stability air flow and thats it. if you can place it in the bottom

[LarsReviews]

down to let it suck cold air

[Oshino Shinobu]

Where the fan draws air from. If you have your PC on carpet, best to put the PSU with the fan up. If it's on hard floor with room below the case and a filter, down is a good way to keep heat out of the case. Down without a filter isn't quite as good, but I'd still go for it over up. 

[Tech_Dreamer]

Nothing.. 

 

it'll keep working properly, Except that you can make the psu suck air in & out from within the case or pull the air from outside the case (cooler air) other than that not much..

[WoodenMarker]

The difference is usually whether your psu is taking in warmer air from inside the case and exhausting it or taking in cooler air from the outside which may or may not be filtered and should be better for the psu. 

[StarFire]

airflow.

[Speedyv]

Your PSU makes more power when it is facing up, it uses the exhaust heat from the rest of your components to make more power.

It's called forced induction. 

 

Pretty self explanatory.