Why am I getting mixed temperature readings from different programs?

Intel Core2 Quad Q6600 @ 2.40 GHz


HW Monitor
On Idle:
Core0: 39c
Core1: 36c
Core2: 33c
Core3: 36c

Speedfan
On Idle:
Core0: 30c
Core1: 25c
Core2: 22c
Core3: 25c

I don't really know which program to trust the most.. but I'm leaning more towards HW Monitor. But, what is going on..? Why are there such big temperature differences?
2 answers Last reply
More about mixed temperature readings programs
  1. I trust none of them unless I can set offsets compared to BIOS!
  2. Speedfan is pretty widely regarded as being inaccurate, and I would generally agree that if the program wasn't supplied by the motherboard manufacturer, don't trust it. They're usually using an estimated value based on a formula. Speedfan's formula is based on what is generally considered to be some inaccurate assumptions, leading to inaccurate results.
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