This cooler is an upgrade to the NH-U12S. It is slightly larger and has a higher RPM fan. This Noctua cooler installed comes with 2 fans for each side of the cooler. We only install one fan to reduce the weight of the cooler for shipping. The 2nd fan can be installed, but is optional, we send it with. Cooling performance is not significantly different with the 2nd fan installed, so you can leave it off.

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