So when the ambient temperature is below 20 degrees celcius (roughly), my northbridge fan makes this LOUD whirring sound when i boot my computer. It usually subsides within a minute or so completely... It only started doing this about a month after I assembled my computer. Is my fan going to die soon? I can touch the fan while the comp is running and it still seems to spin very fast without struggle... When should i start getting worried? I have already looked into alternative cooling solutions for the NB chipset (Zalman passive heatsinks)... Any advice. Thanks a lot.