You can absolutely not trust MB sensor reading. With an air cooling I was getting 4-5°C difference between CPU temps measured with a ABIT NF7-S V.2.0 temp sensor and a Senfu digital thermometer touching the side of a CPU, with a later always higher. Since I installed a waterblock and unplugged a CPU fan something changed and now CPU sensor temp are averagely 2-3°C higher than measured with a Senfu digital thermometer. Go figure???
My advise to you is to buy a digital thermometer (10$) and to forget about MB sensor readings. Much more reliable and stays same even when you change a BIOS...
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