K8N Neo2 Buzzing Chipset Fan?

[mdahc]

For those who own a K8N Neo2, does your chipset fan make a buzzing noise every now and then? Sometimes when I power up, my fan will make a rather loud buzzing noise, and then it will stop about a minute or two after Windows loads. This happened with my old Abit KR7A board as well (it too had an active heatsink on the chipset). Recently, though, this noise occurs every time I power on my machine. So if any of you has had a similar experience and have found a workaround, let me know. I was thinking of maybe buying a passive heatsink? Is this a good idea for nForce3 Ultra (with an overclocked CPU)? On the other hand, if nForce4 boards actually come out by next month, I think I might bite the bullet and just get one with a passive heatsink (i.e. the Asus A8N or whatever the name will be). Any suggestions would be greatly appreciated. Thanks for the time and the input.