[all variants] Fan on cpu (newbie n00b question)

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http://ubuntuforums.org – Hi, I have a fan than goes over my cpu slot in the motherboard. It is louder than I wish. Other than getting a new fan, is there a way to solve this? If not, then what type of fan would I seek? Any recommendations? I do not want anything too expensive; this is an old computer. Thanks. mobo: ASUS p4s800 cpu: p4 2.4 ghz (Hardware)