Arctic Freezer 36 CO CPU Air Cooler

The ARCTIC Freezer 36 CO is a single-tower CPU air cooler engineered for continuous, round-the-clock operation. Its push-pull fan configuration pairs two ARCTIC P12 PWM PST CO 120 mm fans to move air efficiently through the aluminium fin stack, while an aluminium top plate conceals the soldered heatpipe ends for a clean, composed aesthetic that suits a wide range of PC builds. At the heart of the cooler are four 6 mm copper heatpipes arranged to spread heat rapidly across 59 aluminium fins, each just 0.4 mm thick. The open-sided fin stack incorporates a side-flow design: the rear pull fan draws additional cool air in from the case, improving overall thermal throughput without requiring extra components. The CO suffix signals the distinguishing feature of this variant: both P12 PWM PST CO fans are equipped with dual Japanese ball bearings rather than fluid-dynamic or sleeve bearings. Ball-bearing fans withstand elevated temperatures, vibration, and dust ingress more reliably over extended runtimes, making this cooler particularly suited to workstations, servers, or any system expected to run under sustained load. Installation is straightforward. ARCTIC’s clip-free mounting system lets both fans snap into the heatsink via an integrated click mechanism — no separate wire clips required — so swapping fans or removing the cooler is possible even when the unit is already seated in a case. For Intel LGA1851 and LGA1700 builds, an included ARCTIC contact frame replaces Intel’s Independent Loading Mechanism, reducing mechanical deformation stress on the CPU die and mainboard PCB. AMD AM5 and AM4 sockets are supported without a contact frame. Fan speed is fully PWM-controlled across a 200–1800 rpm range, with a 0 rpm stop mode that halts the fans entirely when the PWM signal drops below 5 %, contributing to quieter operation during light workloads. A 200 mm primary cable plus an 80 mm PST splitter cable routes both fans from a single 4-pin PWM header on the motherboard. ARCTIC backs the cooler with a six-year manufacturer warranty. Verified Specifications: • Model: Freezer 36 CO (ACFRE00122A) • Socket Compatibility: Intel LGA1851, LGA1700 | AMD AM5, AM4 • Cooler Dimensions: 104 mm (L) × 126 mm (W) × 159 mm (H) • Cooler Weight: 890 g • Heatpipes: 4 × 6 mm diameter, copper • Fin Stack: 59 fins × 0.4 mm, aluminium • Fans: 2 × ARCTIC P12 PWM PST CO, 120 mm • Fan Speed: 200–1800 rpm, PWM controlled (0 rpm below 5 % PWM duty) • Fan Bearing: Dual ball bearing (Japanese) • Electrical: 0.10 A | 12 V DC • Cable: 200 mm + 80 mm PST splitter, 4-pin PWM connector + 4-pin plug • Included TIM: ARCTIC MX-6 (0.8 g) • Operating Ambient Temperature: 0–40 °C • Warranty: 6 years