Noctua\'s DX line of coolers has become the default choice in high performance quiet cooling solutions for Intel Xeon CPUs. The latest i4 revisions supports LGA2011 (both Square ILM and Narrow ILM), LGA1356 and LGA1366 based Xeon platforms.The larger of the two coolers, the NH-U12DX i4 comes equipped with Noctuas award-winning NF-F12 focused flow PWM fan for automatic speed control while the smaller NH-U9DX i4 is supplied with two NF-B9 92mm PWM Fans in a push-pull configuration for ultimate performance.Due to its slim design, the NH-U12DX i4 now provides easy access to the memory slots and better compatibility with tall modules. Both coolers are fitted with the professional SecuFirm2 mounting system and are bundled with Noctua\'s industrial-grade NT-H1 thermal compound making the NH-U9DX and NH-U12DX complete premium quality coolers for quietly cooling Xeon based workstations and servers.Award-winning NH-U9/U12DX SeriesThe NH-U9/U12DX i4 is based on the latest version of Noctuas award-winning NH-U9/12 coolers. First introduced in 2005, the NH-U series have become a standard choice for premium quality quiet CPU coolers and have won more than 400 awards and recommendations from leading international hardware websites and magazines.Easier access to RAMThanks to its slim design with only 45mm fin depth, the NH-U12DX i4 ensures easy access to the RAM slots. When installed parallel to the slots, it will not overhang the memory on LGA1356, LGA1366 and LGA2011 Square ILM even with two fans installed, thus providing full compatibility with tall RAM heatsinks.High quality Noctua FansRecommended by more than 150 hardware publications and thousands of enthusiasts world-wide, Noctuas premium quality NF-F12 Focused Flow 120mm PWM fan supplied with the NH-U12DX is renowned to combine superb static pressure, excellent heatsink performance and surprising quietness of operation.The NH-U9DX is supplied with two NF-B9 92mm PWM Fans in a push-pull configuration and features Noctuas renowned SSO bearing as well as advanced aerodynamic optimisations such as Bevelled Blade Tips and Vortex-Control Notches in order to achieve its superb quiet cooling capability.PWM Support and Low-Noise AdaptorThe NF-F12 120mm fan supplied with the NH-U12DX i4 supports PWM for convenient automatic speed control through the motherboard. In addition, the maximum fan speed can be reduced from 1500 to 1200 rpm using the supplied Low-Noise Adaptor for even quieter operation.NT-H1 Thermal CompoundHaving received more than 100 awards and recommendations from hardware journalists around the world, Noctuas NT-H1 is a proven professional grade TIM solution that provides minimum thermal resistance, excellent ease of use and outstanding reliability.Features:- PWM support and Low-Noise Adaptor- Anti-vibration pads and fan-clips for second- SecuFirm2 mounting system- 4U Compatibility- 6 years warrantySpecification:- Socket compatibility: Intel LGA2066, 2011 (Square ILM & Narrow ILM), LGA1356, LGA1366 (with Xeon backplate)- Size HxWxD (mm): 158 x 125 x 45- Weight: 755g (With Fan)- Model: Noctua NF-F12 PWM- Number Supplied: 1 - Fan Connector: 4 Pin PWM- Max RPM: 1500- Max Airflow: 54.97- Noise Level: 22.4- Warranty: 6 Years**For an free AM4 bracket please visit the manufacturer support page with proof of purchase of the cooler and proof of purchase for the Ryzen CPU. We will try our best to get some brackets but you should contact the manufacturer first. **