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My core2duo with the stock Intel fan runs between 39C and 50C... occassional bursts to 52C, and that is with it overclocked about 10-15% most of the time.
If you are getting high CPU speeds, check a few things out: Make sure your fan installed right, that all four legs are firmly secured into the motherboard, and that you have 100% contact with the CPU... any gaps, and you get hotspots (death is approaching).
Also, make sure you have the monitoring software that came with your motherboard installed, and make sure it is actually spinning up the fan. At 70C it should be turning something like 3000rpm or even higher trying to cool the CPU.
Also, check your overall airflow. This take a little bit of thinking, when I went form a P4 regular to a core2duo, I had to reverse a case fan to improve the overall airflow and to properly cool not only the CPU but the air inside the case. You cannot cool a CPU if the air inside the case is hot. If you don't have a case fan (outside of the fan on the power supply) consider getting one and installing it to improve airflow inside your case.
You can check to see if this is the situation by running your machine with the case open, and seeing if the CPU temp drops.
Good luck.
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