I have a socket LGA 775 Intel Celeron chip running at 3Gb inside a slim ATX case (a Dell Vostro 200 Slim to be exact). The computer operates as a simple router and typically shows practically no load. Recently, the stock heatsink and fan assembly has begun to make a lot of noise. I wonder if the setup would be better off without the fan on the heatsink, essentially making it passive.Is this a reasonable idea, or does it make more sense to purchase a heatsink that is designed to be passive, and hope that it fits my slim case?