Overall this "all copper" Thermaltake fan-cooler cooled down my Mobo in an order of magnitude of about 10 Celsius, and my Prescott CPU about 7 Celsius. I was expecting more, but the heat-sink paste used was far from good. I expect to improve the performance with a better heat-sink compound. And don't forget that copper is far superior to aluminum as a heat transfer material. Recommended for Prescott P4 CPU users.