what kind of card/ fan do you have on it? you might need to get a better card cooler.
has some great stuff that will help out. If your OC'ing (in a sense) then you might want to invest in something even more powerfull on the cooling side.
you can creat a duct system to bring the cool air from the fan into the case, and move the pump somewhere else in the room (opposite corner)
Finally make sure your fans are pointing in the right directions to move air throughtout the case.