Thermaltake Blue Orb II CPU Cooler
 

The Blue Orb II is silent and cooling performance is very good however for the overclockers out there this cooler was unable to challenge the Big Typhoon and the Freezer 64 Pro when Prime stability was factored in. Priced around $40 this would be a great replacement cooler to the stock AMD64 unit.

http://www.3dxtreme.net/index.php?id=ttblueorb111