Noctua NH-U9DX (INTEL)

Based on Noctua's compact NH-U9 series and fitted with the award-winning NF-B9 fan and NT-H1 thermal compound, the NH-U9DX forms a complete premium quality package that provides excellent quiet cooling performance for 4U Xeon workstations and servers. The new SecuFirm2™ mounting system for socket 771 is highly convenient and makes the NH-U9DX a tailor-made drop-in replacement for standard Intel coolers. To make your Xeon systems quieter has never been so easy!

Features:
Tailor-made for Dual Xeon
The NH-U9DX's fin shape has been modified so that two coolers form an air duct on Dual Xeon setups, producing superior cooling performance at very low noise levels.

SecuFirm2™ for Socket 771 and 604
Completely pre-installed, the new SecuFirm2™ mounting system ensures maximum convenience and extremely short installation time.

Drop-in replacement for standard Intel coolers
SecuFirm2™ for Socket 771 is fully compatible with the original Intel installation system so that the NH-U9DX works as a simple drop-in replacement.

NF-B9 92mm premium fan
Featuring psychoacoustic optimizations and Noctua's premium-grade SSO-bearing, the award-winning NF-B9 is renowned for its exceptional quietness and long-term stability.

NT-H1 thermal compound
Noctua's much-acclaimed NT-H1 is a pro-grade TIM solution that provides minimum thermal resistance, excellent ease-of-use and outstanding reliability.

Specifications:
Socket compatibility  Intel LGA 771 & mPGA 604 (10mm mounting-holes only) 
Height (without fan)  122 mm
Width (without fan)  96 mm
Depth (without fan)  65 mm
Height (with fan)  122 mm
Width (with fan)  96 mm
Depth (with fan)  90 mm
Weight (without fan)  500 g
Weight (with fan)  590 g
Material  Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating 
Fan compatibility  92x92x25 (2 fans can be installed) 
Scope of Delivery  1x NH-U9DO heatsink
1x NF-B9 fan
Mounting-clips for 2 fans
Ultra-Low-Noise-Adaptor (U.L.N.A.)
Low-Noise-Adaptor (L.N.A.)
NT-H1 thermal compound
SecuFirm™ mounting kits for Socket 771/604
Warranty  6 Years 
Fan specifications    
Model  Noctua NF-B9 
Bearing  SSO-Bearing 
Rotational Speed (+/- 10%)  1600 RPM
Rotational Speed with L.N.A. (+/- 10%)  1300 RPM
Rotational Speed with U.L.N.A. (+/- 10%)  1000 RPM
Airflow  64,3 m³/h
Airflow with L.N.A.  52,6 m³/h
Airflow with U.L.N.A.  41,1 m³/h
Acoustical Noise  17,6 dB(A)
Acoustical Noise with L.N.A.  13,1 dB(A)
Acoustical Noise with U.L.N.A.  7,9* dB(A)
Input Power  1,32 W
Voltage Range  12 V
MTBF  > 150.000 h

More info:
http://www.noctua.at/main.php?show=productview&products_id=20&lng=en&set=1