Liquid CPU Cooler Cooler Master MasterLiquid 240 Atmos II 240mm RGB, 240mm radiator, RGB lighting

Cooler Master MasterLiquid 240 Atmos II is an all-in-one liquid CPU cooler with a 240mm radiator and integrated RGB lighting. The compact dual-fan radiator assembly is intended for PC systems that require improved CPU heat dissipation while maintaining a smaller footprint than larger radiators. The unit combines a pump-mounted cold plate, sealed coolant loop and two 120mm fans to move heat from the processor to the radiator fins for more consistent temperatures under load.

Advantages

The closed-loop design requires no custom tubing or refills and simplifies installation compared with custom water cooling. Two 120mm fans on the 240mm radiator improve thermal transfer and provide higher airflow than a single-fan solution, while the integrated RGB lighting offers configurable illumination that matches common motherboard and RGB controller standards. The pump and fan configuration is engineered to reduce operational noise relative to some high-speed air coolers, supporting quieter system operation under moderate to heavy workloads.

Suitable for

• Gaming desktop builds with mid-size to full-size cases that support a 240mm radiator
• Content creation and rendering workstations needing improved sustained cooling
• System upgrades where a compact AIO cooler is required to replace stock or lower-performance air coolers

Key specifications

• Radiator size: 240mm, dual 120mm fan configuration
• Cooling type: closed-loop (all-in-one) liquid cooling
• Fans: two 120mm PWM-controlled fans designed for balance of airflow and static pressure
• Lighting: integrated RGB lighting compatible with common motherboard sync standards and external RGB controllers
• Pump: compact integrated pump assembly with sealed cold plate
• Compatibility: designed for use with mainstream desktop CPU sockets (verify socket support before installation)

How to use

Install the radiator into a compatible case mounting position that supports a 240mm radiator, typically the top or front panel, following the case manufacturer’s guidance. Secure the pump/block assembly onto the CPU using the provided mounting hardware and align the cold plate contact with the CPU heat spreader. Connect fans and pump to the motherboard headers or fan controller for power and PWM control and attach RGB lighting connectors to the appropriate RGB header or controller. Apply thermal paste as directed, ensure all screws are tightened evenly to avoid uneven pressure, and confirm that fan airflow orientation matches your case cooling strategy before powering the system.

Recommendations

Maintain unobstructed airflow through the radiator by keeping dust filters and fan blades clean. Use motherboard fan curves or a fan controller to balance noise and cooling performance. Check mechanical mounting and cable routing periodically to ensure secure connections and optimal pump operation. When upgrading or replacing an existing cooler, verify clearance for memory modules and VRM heatsinks to avoid interference with the pump or radiator placement.