"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, " - Were the two temp sensors attached to the same point? Or was one of the sensors an on-board/on-chip sensor?
There will always be differences in temp depending on where the measurements are taken from. Even if you have two perfectly calibrated sensors - if they are sensing from slightly different points then they will return different temp readings!
There can be 6 celsius or more difference between reported temp and actual temp with an on-chip thermal diode. Results will even be different between bios and windows readings. On-chip thermal sensors are designed to give an approximate reading rather than a high-precision reading.
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