Depending on which NH-U12P cooler you pick up dictates its compatibility - The standard cooler is suitable for both AMD and Intel systems, from the latter's LGA 775 socket to the formers Socket AM2 and AM2+, while the NH-U12P SE1366 only ships with support for Intel's new Core i7, Socket LGA 1366 CPUs. The actual body of the cooler itself is a pretty hefty beast, weighing in at 600 grams, which supports the installation of either one or two 120mm fans, with the SE1366 edition of the cooler shipping with a pair of fans by default compared to a single fan on the standard bundle. These bundled fans take the form of Noctua's own most excellent NF-P12 part, complete with its Ultra Low Noise Adapter to drop the fan's rotational speed to 900 RPM from its default 1300 RPM if you're looking to make your cooling solution as quiet as possible.