Noctua\'s DX line of coolers has become a default choice in high performance quiet cooling solutions for Intel Xeon CPUs. The i4 revision supports LGA2011 (both Square ILM and Narrow ILM), LGA1356 and LGA1366 based Xeon platforms and the new D9 model provides better performance and better compatibility than previous 9cm versions: Thanks to its 95x95mm footprint and reduced 110mm height, the NH-D9DX i4 is fully 3U compliant and clears the RAM slots on LGA2011 Square ILM and LGA13xx. At the same time, the dual tower design and the new NF-A9 PWM guarantee further improved quiet cooling performance. Fitted with the professional SecuFirm2 mounting system and bundled with Noctua\'s industrial-grade NT-H1 thermal compound, the NH-D9DX i4 3U forms a complete premium quality package for quietly cooling Xeon based workstations and servers.3U compatibilityThe NH-D9DX i4 stands only 110mm tall. This is 15mm less than previous 4U compliant 9cm DX-line coolers and allows the NH-D9DX i4 to also fit 3U cases - ideal for noise-sensitive 3U applications in fields such as audio or video processing!100% RAM compatibility With its 95x95mm footprint, the NH-D9DX i4 does not overhang the RAM slots on LGA2011 Square ILM, LGA1366 and LGA1356. This gives the user full access to the memory modules and guarantees 100% compatibility with tall heatspreaders or optional memory fans.NF-A15 NF-A9 premium fanThe highly optimised NF-A9 premium fan features Noctuas proprietary AAO frame as well as sophisticated aerodynamic design measures such as Flow Acceleration Channels, which allows it to further improve the renowned efficiency of Noctuas previous 92mm models and contributes to the NH-D9DX i4 superior cooling performance. buttonPWM support and Low-Noise AdaptorThe NF-A9 92mm fan supplied with the NH-D9DX i4 supports PWM for convenient automatic speed control through the mainboard. In addition, the maximum fan speed can be reduced from 2000 to 1550rpm using the supplied Low-Noise Adaptor for even quieter operation.Dual fan readyThe NH-D9DX i4 includes an extra set of fan mounting clips for users who want to achieve even better cooling performance by adding a second, optional NF-A9 to the front fin stack. Using the y-cable supplied with the NF-A9 PWM retail fan, both fans can be connected to one CPU fan header.*SecuFirm2 mounting systemNoctuas SecuFirm2 mounting systems have become synonymous with quality, safety and ease of use. Supporting Intels lga 2066, LGA2011 (both Square and Narrow ILM), LGA1356 and LGA1366 Xeon platforms, the SecuFirm2 mounting included with the NH-D9DX i4 guarantees perfect contact pressure and maximum convenience on all sockets.NF-A15 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. button6 years warrantyNoctua products are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the supplied NF-A9 features an MTBF rating of more than 150.000 hours and the entire NH-D9DX i4 package comes with a full 6 years manufacturers warranty.Specifications:- No fan: 95 x 110 x 95 mm (W x H x D) - With fan: 95 x 110 x 95 mm (W x H x D)- Material: Nickel Copper (base plate, heat pipes), aluminum (fins)- Weight: - Fanless: about 428 g - with fan: about 531 g- Heatpipes: 4x 6 mm- Fan: 1x 92 mm NF-A9 PWM - standard: 22.8, dB (A), 2000 U / min, 78.9 m / h - LNA: 16.3, dB (A), 1550 U / min, 62.6 m / h - Power consumption: 1.2 W - Operating voltage: 12 V - MTBF> 150,000 hours- Compatibility: - Intel LGA 2066, 2011, 2011 V3 (Square ILM / Narrow ILM) 1356 1366 (with optional Xeon backplate)- Manufacturer warranty: 6 years