Motherboard BIOS temps or HMonitor more accurate?

Hi All,

Have an Intel D975XBX2 mobo and a QX6700 chip with an Intel Pentium D HS/F
(low noise). Motherboard BIOS hardware monitoring says the CPU idles in the
mid to high 30s, but HMonitor ver. 4.3.1.1 says the chip -- actually CPU0 --
is idling in the mid 50s. Quite a difference. Whom shall I believe? Thx.

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RJ