After installation it was not really quieter than the boxed at full load ... so I was first disappointed. When I then gradually down regulated Him and however the CPU temps with Core Temp always kept an eye on me this much. I am 30-40% of its speed reached in ca and the CPU is not warmer than when I turn him on full load at normal capacity utilization .... under Prime 95 I have not yet tested.
At the low speed of the volume it is then very well, and keeps my AMD Athlon X2 255 in desktop operating on slim 20-23 degrees.