Noctua NL-LC1-42 Non-RGB 420mm AIO Liquid CPU Cooler (Black)

The Noctua NL-LC1-42 is a premium 420mm all-in-one liquid CPU cooler designed for enthusiasts who demand exceptional thermal performance without compromising on acoustics. Built on the Asetek Emma V2 pump platform, the NL-LC1-42 pairs proven AIO engineering with Noctua's own NL-PNA1 pump noise absorber — a three-layer acoustic soundproofing structure that employs tuned-mass damper technology to reduce both airborne noise and structure-borne vibration from the pump unit. Three Noctua NF-A14x25 G2 PWM fans, each measuring 140 × 140 × 25 mm, draw air through the extra-large 459.5 × 143.7 × 30 mm aluminium radiator. These flagship 140mm fans feature SSO2 self-stabilising oil-pressure bearings and spin up to 1,500 RPM, producing a combined maximum airflow of 91.58 CFM (155.6 m³/h) at 2.56 mm H₂O static pressure, with peak fan noise capped at 24.8 dBA. A speed-offset between fans is used to avoid beat-frequency harmonics, keeping the acoustic signature smooth and unobtrusive even under sustained load. The Asetek Emma V2 pump is PWM-controlled across a 750–3,400 RPM range (2 W typical, 6 W maximum) and ships in a pre-selected quiet mode that holds pump noise below 5 dBA. A three-position mode switch lets users choose between quiet, balanced, or full manual control to dial in the performance-to-noise ratio that best suits their workload. The copper cold plate ensures efficient heat transfer from the CPU die to the liquid loop. Installation is handled by Noctua's SecuFirm2+ multi-socket mounting system, supporting Intel LGA 1700 and LGA 1851 as well as AMD AM4 and AM5 sockets. Noctua NT-H2 thermal paste is included in the box. For users who need airflow directed at nearby VRMs, RAM, or M.2 SSDs, the magnetically attaching metal faceplate on the NL-PNA1 can be swapped for the separately available NL-ACF1 auxiliary cooling fan. The NL-LC1-42 ships without RGB lighting, keeping the aesthetic clean and unobtrusive. Total system weight is 2.289 kg. Noctua backs the cooler with a 6-year manufacturer's warranty. Verified Specifications: • Radiator size: 420 mm | Dimensions: 459.5 × 143.7 × 30 mm | Material: Aluminium • Cold plate material: Copper • Pump: Asetek Emma V2 | Speed: 750–3,400 RPM (PWM) | Power: 2 W typical / 6 W max | Noise (Quiet Mode): <5 dBA • Fans: 3 × Noctua NF-A14x25 G2 PWM (140 × 140 × 25 mm) | Speed: 0–1,500 RPM • Airflow: 91.58 CFM (155.6 m³/h) | Static pressure: 2.56 mm H₂O | Max fan noise: 24.8 dBA • Bearing type: SSO2 | Tube length: 450 mm • Socket support: Intel LGA 1700, LGA 1851 | AMD AM4, AM5 • Thermal paste: NT-H2 (included) | Mounting: SecuFirm2+ • RGB lighting: None | Weight: 2.289 kg | Warranty: 6 years