Noctua Fan NH-U9DO A3 for AMD Opteron G34 C32 CPU Cooler SSO Bearing Socket compatibility: AMD G34, C32, F (3.5" & 4.1") Material: Copper (base and heat-pipes) aluminum (cooling fins) soldered joints & nickel plating 2x NF-B9 premium fan The NH-U12DO A3 is based on Noctua's much acclaimed NH-U series which have received more than 300 awards and recommendations from the international press. Six heatpipes, a performance optimized fin stack and an enlarged contact surface suitable for socket G34 allow for further improved performance. Noctua's NM-A3 SecuFirm2TM mounting system makes it possible to install the cooler rotated by 90 in order to allow for an optimal positioning of the cooler and to evade compatibility issues on dual socket mainboards.