SLK900U +
Vantec Tornado 92mm TD9238H with 4800RPM 119CFM airflow
Delta FFB0912EHE 92mm with 4800RPM 114CFM airflow
Delta FFB0812EHE 80mm with 5700RPM 80.1CFM airflow
ThermalTake 80mmSmart Fan 2 76CFM
CoolerMaster XDream Fan 80mm @ 4800RPM 63CFM

Sure can handle the heat of P4 2.4C @ 3.6GHz++....
Don't worry mate...