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Have you got a well-vented case? Do you have a hot videocard or power supply inside? These are all factors which can contribute to inside temperature rising by 2-3° C each!
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That seems to be the problem. Lower temps can be achieved using better cooler for the CPU and some good coolers for the case, generating enough air-flow. At that moment I will not use my CPU with 4 cores or overclock.
10x again!