Hardware Canucks posted a review of the Noctua NH-C12P CPU Cooler

As we will see later in the review, the NH-C12P is not a modified tower cooler or a hybrid anything, but rather has been designed from the ground up as down draft cooler and shouldn't suffer from many of the design flaws other heatsinks of this type are afflicted with. Now this is a lofty goal to say the least and while many have claimed to have done it, the end result is usually different than the marketing spin. However, if there is one company that we would trust to design from the ground up the perfect downdraft cooler it would Noctua.

Noctua NH-C12P CPU Cooler Review