This product is either discontinued or we cannot get that from suppliers.
Noctua U9-TR4-SP3, Bearing SSO2, Rotational Speed, ±10% 1500 RPM, Rotational Speed with L.N.A. ±10% 1200 RPM, Min. Rotational Speed ±20% 300 RPM, Airflow 54.9CFM, Airflow with L.N.A.43.7 CFM, Acoustical Noise 22.4 dB(A), Acoustical Noise with L.N.A.18.6 dB(A), Input Power 0.6 W, Voltage Range 12 V, MTTF > 150,000 h.
Noctua’s NH-U9 TR4-SP3 is an excellent choice for AMD’s Threadripper CPUs where space is limited. It supports CPUs with a maximum of 180W but does not support overclocking. Having received more than 300 awards and recommendations.