Tailored to provide superior RAM and PCIe compatibility, the NH-D15S is an asymmetrical single fan version of Noctua\'s award-winning flagship model, the NH-D15. Thanks to its asymmetrical design, the NH-D15S clears the top PCIe slot on most Micro-ATX and ATX motherboards. At the same time, the single fan setup and recessed lower fins guarantee 100% RAM compatibility with memory modules of up to 65mm height. Users who have sufficient room can also upgrade the cooler with either a 120mm or round 140mm fan on the front fin stack for further improved performance in dual fan mode. Topped off with the trusted, pro-grade SecuFirm2 multi-socket mounting system, Noctua\'s proven NT-H1 thermal compound and full six year manufacturer\'s warranty, the NH-D15S forms a complete premium quality solution that combines dual tower efficiency with excellent compatibility and flexible upgrade options.Specification:- Compatibility: Intel LGA 2066/2011-0/1155/1156/1150/1200 and AMD AM4/AM3+/AM3/AM2+/AM2/FM1/FM2/FM2+- Max TDP: All- Installation Method: Intel and AMD - backplate, requires motherboard removal- Height (without fan): 160 mm- Width (without fan): 150 mm- Depth (without fan): 135 mm- Height (with fan): 165 mm- Width (with fan): 150 mm- Depth (with fan): 135 mm- Weight (without fan): 980 g- Weight (with fans): 1150g- Material: Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating- Fan compatibility: 140x150x25, 140x140x25, 120x120x25 (with 120mm mounting holes)- Fan Model: One Noctua NF-A15 PWM- Fan Bearing: SSO2-Bearing- Fan Rotational Speed (10%): 1500 RPM- Fan Rotational Speed with L.N.A. (10%): 1200 RPM- Min. Rotational Speed (PWM, 20%): 300 RPM- Max. Airflow: 82.5 CFM- Max. Airflow with L.N.A.: 67.9 CFM