i tired both ways.. still too short.. and my psu.. the fan in at the bottom.. the front no fan 1.. so if i put the fan sucking the air inside the pc, its gonna be hot.. coz i oc my rig till the NB very hot, plus my super hot 8800GT and 4ghz proc.. so better suck cool air from the bottom.. my whole pc inside all hot air.. ram also super hot..