ARCTIC Freezer 4U-M Single Tower CPU Air Cooler

The ARCTIC Freezer 4U-M (model ACFRE00133B) is a single-tower CPU air cooler engineered for high-performance server and workstation environments. Designed to fit 4U and larger server rack enclosures as well as compatible consumer 4U chassis, it provides a reliable passive-plus-active thermal solution for demanding multi-core processors. The cooler is compatible with a wide range of current server socket platforms: on the Intel side it supports LGA 4189 and LGA 4677, and on the AMD side it supports SP6, SP3, sTR5, TR4, sTRX4, and sWRX8. This breadth of compatibility makes it a practical choice for administrators running dual-socket server motherboards, as its compact 124 mm × 156 mm footprint accommodates such configurations. At the heart of the design are eight 6 mm direct-touch copper heat pipes that draw heat away from the CPU heat spreader into a 57-fin aluminium fin stack. Two 120 mm PWM fans operate in a push-pull arrangement, spinning between 400 and 2,300 RPM under PWM control via a standard 4-pin connector, with a noise ceiling of 40 dBA at maximum speed. The dual ball-bearing fans are rated for 24/7 continuous operation, making them appropriate for always-on server deployments. Total cooler power draw is 2.88 W (0.12 A at 12 V DC per fan), and the startup voltage is 8 V DC. The overall installation height of 145 mm is optimised to clear standard 4U rack rail heights, and 53 mm of RAM clearance accommodates memory modules fitted with moderate heatsinks. The cooler ships with an ARCTIC MX-6 thermal compound syringe (0.8 g), which is neither electrically conductive nor capacitive. A 6-year warranty is provided. Verified Specifications: • Model: ACFRE00133B • Compatibility — Intel: LGA 4189, LGA 4677 | AMD: SP6, SP3, sTR5, TR4, sTRX4, sWRX8 • Dimensions: 124 mm (L) × 156 mm (W) × 145 mm (H) • Weight: 1,275 g • Heat pipes: 8 × Ø 6 mm, direct-touch • Fin count: 57 | Fin material: Aluminium • Fans: 2 × 120 mm PWM, push-pull • Fan speed: 400–2,300 RPM (PWM) • Noise level: 40 dBA • Bearing: Double ball bearing • Connector: 4-pin PWM • Cable length: 200 mm • Electrical: 0.12 A | 12 V DC; startup 8 V DC • Thermal compound: ARCTIC MX-6, 0.8 g • Operating ambient temperature: 0–40 °C • Server rack fit: 4U and above • RAM clearance: 53 mm • Warranty: 6 years