I have a ol' wolfdale overclocked to 4.0ghz, at max load i get 45-46c on the cnps 9900max.
The funny thing is, the fan pulls so much air that it actually keeps my gfx card like 5c cooler. When I got this cooler it was one of the few air sinks that came with a pwm fan. When combined with the included resistor cable for the pwm connection, it's pretty quite.