You could always try a heat sink. They look like the things on the back of fridges and radiators. Please make sure you get one good enough for the job though. Otherwise you will end up with a dead CPU. You may also find your AGP card is making a huge amount of noise, as some of them are real noise monsters. I have a P4 in my machine and the AGP card is noisier than the processor fan.
Perhaps someone else can tell you exactly what sort of heat sink you can use. Also, it depends on whether it will fit in the case of your computer or not.
Hope this is some help.