If you haven't done so a good case and heatsink cleaning will help on a older system. Make sure cables are tied up and out of the way. If you don't have one intake and one exhaust fan (not counting PowerSupply) then you may want to and fan/s. One in the lower fron one towards the upper back.
Also as Walt stated 50C is within range. You can run Price95 Torture Test and monitor temps to see what you running under a full load. Do a Google seach for Price95 if you don't have it.
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