Fans need to be matched carefully to the socket type of the MB. After that, it has to meet the heat/speed requirements of the CPU. (Even if it fits it might not "cool enough"...) Some fans need to have a third sensor wire or some MBs will turn off. They assume the fan failed. (Other MBs will happily let the CPU fry with a failed fan...) The "little things" someone saw might be a form of punch-in rivets. I removed almost ALL quoting since there were two Anns and it was getting very confusing. Rick Glazier From: "g.Computer9f" I found this fan ($18) Visit our website regularly for FAQs, articles, how-to's, tech tips and much more http://freepctech.com