Noctua i4 CPU Cooler for Intel Xeon CPU_ LGA2011, 1356 and 1366 Platforms NH-U9DXi4 Sporting 4 heat pipes, a surface area of more than 3800cm Squared & 2 premium grade 92mm fans, NH-U9DXi4 provides a significant upgrade in quiet cooling performance compared to common 2U solutions. The award-winning NF-B9 92mm premium fan features Noctua's renowned SSO bearing as well as advanced aerodynamic optimizations. In order to achieve its superb quiet cooling capability, the NH-U9DX i4 comes equipped with two NF-B9 fans in a push/pull setup. The NF-B9 92mm fans supplied with the NH-U9DX i4 support PWM for convenient automatic speed control through the mainboard. The maximum fan speed can be reduced from 1600 to 1300rpm using the supplied Low-Noise Adaptors for even quieter operation. Supporting Intel's LGA2011 (both Square and Narrow ILM), LGA1356 and LGA1366 Xeon platforms, the SecuFirm2 mounting included with the NH-U9DX i4 guarantees perfect contact pressure and maximum convenience on all sockets. Having received more than 100 awards and recommendations from hardware journalists around the world, Noctua's NT-H1 is a proven professional grade TIM solution that provides minimum thermal resistance, excellent ease of use and outstanding reliability.