Product discontinued. Successor model: NH-U12DX i4

Product discontinued.

Based on Noctua's signature NH-U12 series and fitted with the award-winning NF-P12 fan and NT-H1 thermal compound, the NH-U12DX forms a complete premium quality package that provides outstanding quiet cooling performance for Intel Xeon workstations and servers. The new SecuFirm2™ mounting system for socket 771 is highly convenient and makes the NH-U12DX a tailor-made drop-in replacement for standard Intel coolers. To make your Xeon systems quieter has never been so easy!

If you're interested in using our coolers on Intel Xeon platforms, please don't hesitate to contact us at sales@noctua.at! Bundles can be customized for system integrators.
Tailor-made for Dual Xeon

Tailor-made for Dual Xeon

The NH-U12DX'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

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

Drop-in replacement for standard Intel coolers

SecuFirm2™ for Socket 771 is fully compatible with the original Intel installation system so that the NH-U12DX works as a simple drop-in replacement.
NF-P12 120mm premium fan

NF-P12 120mm premium fan

Featuring psychoacoustic optimizations and Noctua's premium-grade SSO-bearing, the award-winning NF-P12 is renowned for its exceptional quietness and long-term stability.
NT-H1 thermal compound

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.
Cooler Specification
Intel LGA 771 & mPGA 604 (10mm mounting-holes only)
Height (without fan)
155 mm
Width (without fan)
126 mm
Depth (without fan)
65 mm
Height (with fan)
155 mm
Width (with fan)
126 mm
Depth (with fan)
90 mm
Weight (without fan)
600 g
Weight (with fan/s)
770 g
Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating
Intel Xeon 5xxx & Xeon 7xxx
Fan compatibility
120x120x25mm / 120x120x38mm (2 fans can be installed)
Scope of Delivery
  • 1x NH-U12DX Heatsink
  • 1x NF-P12 fan
  • Mounting-clips for 2 fans
  • Ultra-Low-Noise-Adaptor (U.L.N.A.)
  • NT-H1 thermal compound
  • SecuFirm2™ mounting kits for 771/604
6 Years
FAN Specification
Blade Geometry
Rotational Speed (+/- 10%)
1300 RPM
Rotational Speed with L.N.A. (+/- 10%)
1100 RPM
Rotational Speed with U.L.N.A. (+/- 10%)
900 RPM
Acoustical Noise
19,8 dB(A)
Acoustical Noise with L.N.A.
16,9 dB(A)
Acoustical Noise with U.L.N.A.
12,6 dB(A)
Input Power
1,08 W
Voltage Range
12 V
> 150.000 h
28.02.2009 // Phoronix.com

NH-U12DX Review

Like the results under idle, the Noctua NH-U12DX was also able to do a much better job when under load. With the NH-U12DX, the CPU temperature varied from 43°C to 57°C while the system temperature was in the low 30s.
Test verdict: "Not only did the Noctua NH-U12DX perform much better than the Dynatron D6EG heatsink, but also it was also much quieter. The NF-P12 is barely audible when running inside of an enclosure, compared to the D6EG 60mm fan that can absolutely scream when Pulse Width Modulation (PWM) is not enabled." (Michael Larabel, Phoronix.com)
24.10.2008 // 3DProfessor.org

NH-U12DX Review

Test results have been very good in this construction, we would have liked more time to see just how effective the Ultra Low Noise adaptors would be, though this must await another day. For now, in the low noise mode the Noctua NH-U12DX HSF in triple fan mode is extremely effective. On another point of note, there is of course the option to run with the default fan setting, if you have that more older and meatier TDP 771 Xeon. On a cross check with some other coolers used by a renown EU System Integrator it has been found that the shown above; are extremely good figures indeed. It now would appear that Noctua have got it right, shifting up a major gear and now a force to be reckoned within this exceptionally exclusive arena.
Test verdict: "Though for the experienced end user that likes to build their own, then look no further as these Heat Sink Fan's are quiet, easy to build, insert and use. Finally for those with that viewing window on the chassis side - giving it all that little bit of extra WHOW!" (3DProfessor.org)

Installation Manual (PDF)