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What is your cooling solution, what is your ambient temperature?
Generally I would say RealTemp. Those guys have been meticulous about determining temperature based on Intel's spec. Several times motherboard manufacturer's have been caught implementing wrong.
I personally prefer running RealTemp in DeltaT mode.
I think the bios temp doesnt read the actual individaul cores like realtemp does. anyway idle temps shouldn't concern you anyway because they are extremely inaccurate. temps actually get more accurate as your approach the load temps of the processor