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Board: DG43NBCPU: E8400

Bios Settings:Advanced >> Boot Configuration >> Intel Me Setup Prompt >> Enabled.Advanced >> Fan Control >> Processor Zone Response – Normal Processor Zone Damping – Normal Automatic Fan Detection – AlwaysSave and Exit

Management Engine Bios Extension:Ctrl + P to enter the MEBxIntel ® ME Configuration Intel ® ME State Control: Enabled Intel ® ME Features Control: EnabledManageability Features Selection: NoneIntel ® Quiet System Technology: Enabled (don’t disable)

Fans Connected:CPU FanFront FanRear FanAuxiliary Fan

Bios Version: 77

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Result: The system fans runs at high speed intermittently.

Bios Version: 0074

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Result: The system fans runs at high speed intermittently.

Bios Version: 0069

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Result: The system fans runs at high speed intermittently.Bios Version: 0064

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Result: The system fans runs normally without any sudden low and high speed.

Bios Version: 0060

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Result: The system fans runs normally without any sudden low and high speed.

Conclusion: It seems that the system fans spin briskly from time to time.