PC on the desk or floor?

[NOT_PROVIDED_16]

Should i have my computer on my desk or floor?, i currently have it on the floor (carpet) standing on a bit of chipboard as the PSU cooler is faced down. my desk is 100cm long so the pc could fit on the desk?
the pc case is a Zalman T4

 

[Archaic59]

It won't make any difference unless the PSU does not get air. As long as the PSU gets air it's fine on the floor.

 

[ss202sl]

It will pick up more dust and dirt(sucked in by the fans) on the floor, so you may want to clean it out more often.