Elite Bastards posted a review on the Noctua NH-U12P CPU cooler

Attaching the included NF-P12 fan is simple - Noctua have provided some noise reduction strips which stick to the body of the cooler (with four provided to allow for two fans), onto which the cooling fan can be placed and then clipped to the main heatsink with ease. This mechanism also makes removing and reattaching the fans easy if required (to gain access to system memory if it's blocking your route, for example), which is a definite plus if you're always fiddling with the components in your machine.

Looking to the rear of the cooler, we can see the thirty-six aluminium fins which make up the cooler's main body to dissipate heat drawn away from the CPU by the heatpipes. These fins are also arranged in such a way that they should be sufficiently elevated to stop the heatsink clashing with any motherboard chipset coolers, thus improving its compatibility with most systems.

Noctua NH-U12P CPU cooler Review