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Most CPUs under idle conditions should not be running above 50C (122F). A good temperature to aim for is 40C (104F). And as always when overclocking, the cooler the better. A cooler running CPU will last much longer, and lessens the chance of crashing the system.
A CPU is made up of transistors, when a transistor gets hot, it tends to leak current. Too much leakage can result in calculation errors, too many errors will cause a crash. More speed equals more heat. More heat equals more crashes. Better cooling means less chances of errors, less crashes and more speed .
Your motherboard temperature should be fairly close to room temperature, within 5C (9F) degrees or so. If the motherboard temperature is higher than that, try adding more case cooling.
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