I recently got a refurbished Z600 workstation and immediately noticed that the chipset fan is always running at approx. 2,500 rpm, even right after a cold boot and when idling. I can't image that this is normal - all the temperatures are fine, so I see no reason for the fan to spin this high. I know that it is a small fan which needs the high rpm to create sufficient air flow, but 2,500 rpm seems excessive.
Has anybody experienced this before? Is this in fact the normal idle speed for the chipset fan (as the seller's customer service wants to make me believe)?