Temp sensors

[sparky11]

I have a xp1800 (palamino O/C to 145 fsb) installed in a Asus A7V8X MB the temp readings from the bios are MB 26 cpu 34, Asus PC Probe also shows these temps.When i run Speed fan it reads temps of MB 26 CPU 57 , i previously had this chip in a Gigabyte GA-7VRX MB this boards bios also showed the higher readings,
Which one do i believe?????




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