3D Game Man posted a review on the Zalman CNPS9700 NT CPU Cooler

is one incredible product that is sure to please. If you don't want to install a water cooling system because of the potential risks, then this is a great alternative. I was impressed that this cooler could keep a Core 2 Duo E6400 CPU overclocked to 3.2GHz using 1.55 voltage cool. This is something that's even a challenge for some water cooling kits to accomplish.

Zalman CNPS9700 NT CPU Cooler Review