Hi, check that the inside of your case is not too cluttered up, with the wide ribbon cables perhaps causing a bit of air-flow blockage. If they are, you could change to round ide cables, much cleaner and neater with plenty of air-flow between them. Also, where is your case positioned - if it is on or near the floor, and perhaps in a corner of the room under your pc desk, then best move it so that it has plenty of clean-air flow around it.
Make sure your fans are blowing in correct direction, In at the front of case, Out at the back,
and that the blades are sucking and blowing correctly.
Never make the mistake of removing one side of the case to help cooling - this in fact has the opposite effect and makes the interior hotter.
Hope I'm not 'teaching your to suck-eggs'.