I know this is an old thread, but I just today upgraded my old AMD cpu (AMD Athlon(tm) II X2 240 Processor) which ran close to slient, with an AMD phenomII 965 (black) (AMD Phenom II X4 965 Black Edition Deneb 3.4GHz 125W Quad-Core Processor )
The heat sink that comes with it, is HUGE compared to the old one. However, the fan is very loud.
Temperatures while idle are: 42-44 degrees Celsius (with a fairly loud fan sound at about 5300 RPM)
I was hoping someone else has experience with this CPU and can tell me if it's "normal" or if I should look at replacing the heat sink or returning the CPU.