If you have two case fans and a cpu fan, you might be fine, but you never know with AMD, they tend to heat up alot. You can also put copper or aluminum cold plates of which I am told work well under the heat sink and fan. Try the three fans first and see how she runs, and if you get excessively hot temps, you can add a cold plate if you want, and you could also get a twin turbo fan drive (if you have a 5 1/2 bay open). Those work real well and move a lot of air, but they take up a whole expansion bay and add to the noise just a little. (I like as quite as possible) The 3 fans should be enough, but they also might not. (do you plan to overclock at all?) I have a P4 (which run a little cooler) and I only use one cpu fan, and hardly ever get temps over 50C, which isn't all that hot. For normal use, 3 fans should be plenty for your AMD, but keep in mind the cold plates and twin fan drive.