The BIOS reports the real-time temperature, so, when you're in the BIOS there is absolutely no load on the CPU whatsoever. When you're in Windows though, there is a small load (and fluctuating load) along with all the other components that wouldn't have been doing anything at all while in BIOS. To make a long story short, RealTemp reads the die sensor output directly; thus, it reports whatever the sensors in each core are reading which is the exact same way that the BIOS reports temps. They should be equally reliable.




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