There are three articles in this series all to do with cooling your PC and keeping it quiet at the same time. Worth reading. If your cpu fan is getting louder then the bearings are on their way out and I would strongly advise getting a new fan. AMD processors can be destroyed within a couple of seconds of startup if the fan is not working properly. Have a look at your bios and see if there is a option to have the computer shut down automatically in the event of the cpu overheating.