Noctua NF-A9 FLX 92mm Premium Quality PC Computer Case Noctuas trusted premium quality make it an elite choice for the highest demands. The NF-A9 impeller features suction side Flow Acceleration Channels. Noctua's AAO (Advanced Acoustic Optimisation) frames feature integrated anti-vibration pads as well as Noctua's proprietary Stepped Inlet Design Inner Surface Microstructures, both of which further refine the fan's performance/noise efficiency. Integrated anti-vibration pads made from extra-soft silicone minimise the transmission of minute vibrations while maintaining full compatibility with all standard screws and other mounting systems. With SSO2, the rear magnet is placed closer to the axis to provide even better stabilisation, precision and durability. Providing 1650, 1250 and 1050 rpm speed settings via the supplied Low-Noise and Ultra-Low-Noise Adapters Connector 3-pin Size 92 x92 x 25 mm Low-Noise Adaptor (L.N.A.) Ultra-Low-Noise Adaptor (U.L.N.A.) 3:4-Pin Adaptor 30cm Extension Cable 4 Vibration-Compensators 4 Fan Screws