HP Compaq D530 over heating problem

The north chipset become very hot after 20mins usage. The windows xp freezes.
1. no fan for north chipset
2. CPU fan is not working faster when the system is busy.
1. upgrade to latest Bois, adjust “Fan IDLE”: Value 1-4, I choose 3, it is enough.
2. installed additional fan for the north chipset.

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