A strange one for you, NF7 v2 temperature change

I recently put back into service a Abit NF7 ver 2 motherboard with a AMD unlocked 2500. The
strange thing is that the cpu temperature is different depending whether it is cold booted, been
off for over three hours, or warm booted such as a restart. with a cold boot the CPU temperature
is within 15 f, or 6 c, of the mb temp but upon a warm boot the temperature difference is about 30
, or 16c, of mb temperature. Even with running Sandra burn in the system never get above 47c with
a warm boot so the system does not have a overheating problem, it's just that I find it strange
that the temperature difference changes fro cold to warm. I have used both the ABIT EQ and
Motherboard Monitor Probe, MBProbe and they both return similar temperature so I think the
readouts are close to correct. Any idea what's going on?? Any response appreciated, other than
spelling and grammar correction.
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Thank You

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Check the actual cpu speed with WCPUID in both situations. My nfs7v2 has
started coldbooting at the saved bios settings but warmbooting at a lower
default fsb value.

Also it no longer powers down normally but instead always restarts, and I
have to manually turn off the powersupply to get it to shutdown. The two
occurrences are undoubtedly related, perhaps an aging capacitor or
motherboard battery? It's a few years old now.

rms