I'm having a similar problem. Here is what I'm getting:
CPU temp: IDLE temp: 52 C
Active: 62-71 C
OS: Windows XP SP2
Motherboard: ASUS P5B-Plus series.
Video: Nvidia GeForce 9600GT 1GB.
Program used to diagnostic temp.
ASUS PC Probe II. Comes with the Motherboard CD.
I couldn't find any soultions to this so if you know something please help me
This program intel tells me something completely different to what makes the BIOS or another program to measure temperatures, and passes all the tests and processing temperature does not really understand what happens.
And the PC has given me no problems so far even though the bios I mark something illogical 99 º C
Intel Processor Diagnostic Tool