hi i had this intel pentium D 3.2 ghz when checking the temp in the bios it ran @ +-30 *c but in windows if i just start to play a game it go's up to 100*c and idle @ 40 *c not over clocked at all. why would it do this? thermal paste was fine and tried a bigger cooler asswell.
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Heatsink not properly installed, poor airflow through case, malfunctioning temperature sensors.
^+1 I agree. With the third possibility as most likely. Since the OP didn't say anything about the PC shut down by itself.
@Fannels: Did you experience any auto shut down issue?