Noctua's DO line of coolers has become a default choice when it comes to quietly cooling AMD Opteron CPUs. Upgrading both compatibility and performance, the new A3 model Featuress Noctua's professional NM-A3 SecuFirm2™ mounting system that not only supports socket G34, C32 and F, but also allows to install the cooler turned by 90°. Thanks to six heatpipes, a performance optimised fin stack and its two premium grade NF-P12 120mm fans, the NH-U12DO A3 cools even the hottest high-end Opteron processors at minimum noise levels. Bundled with Noctua's industrial-grade NT-H1 thermal compound, the NH-U12DO A3 forms a complete premium quality package for quietly cooling AMD workstations and servers.Attachment for ATX-Mainboards, screwedSocketsuitable F, G34, C32MaterialAluminum YesCooper YesPower Connection 3-Pin-fan connector (mit Tachosignal)Fan Bearing SSOPower Input 0 - 1.08 watt(s)Voltage Range 0 - 12 VNumber of Revolutions 900 - 1300 rpmVolume 12.6 - 19.8 dB(A)Volumetric Flow 107.7 - 156.8 m3/h, 63.4 - 92.3 cfmDimensionsFans Fan 1 120 x 120 x 25 mmCooler 126 x 158 x 71 mmTotal 126 x 158 x 120 mmWeightCooler 1140 grams