The Cooler Master MasterLiquid Atmos II Stealth 240 liquid CPU cooler integrates a dedicated 85mm VRM fan directly into its waterblock assembly to actively cool your motherboard’s power delivery components alongside the processor. This dual-fan closed-loop cooler combines high-velocity airflow with a long-lasting pump to manage the thermal demands of modern multi-core processors.

Active VRM cooling for stable power delivery under load

High-performance CPUs place immense stress on motherboard voltage regulator modules (VRMs). To prevent thermal throttling of these critical power phases, this cooler features an integrated 85mm VRM fan built directly into the pump block. Operating at speeds from 690 to 4000 RPM, this dedicated fan delivers 2.8 mmH2O of static pressure and 9.3 CFM of airflow directly onto the surrounding motherboard heatsinks. Utilizing a Loop Dynamic Bearing, the VRM fan is rated for a lifespan exceeding 50,000 hours, ensuring long-term system stability during sustained heavy workloads.

High-pressure Mobius 120 Black fans for rapid heat dissipation

The radiator assembly is equipped with two Mobius 120 Black fans engineered specifically to overcome the resistance of dense radiator fins. Spinning up to 2400 RPM, each 120mm fan generates an impressive 75.2 CFM of airflow and 3.63 mmH2O of static pressure. These fans feature Loop Dynamic Bearings that seal oil in a continuous loop to minimize wear, resulting in an exceptional lifespan of over 200,000 hours. Even at maximum velocity, noise is kept to a highly manageable 30 dBA.

Whisper-quiet 3400 RPM pump built for longevity

At the heart of the liquid loop is a high-speed pump operating at 3400 RPM (± 300 RPM). It circulates coolant rapidly through the 350mm-long tubes to the 29mm-thick aluminium radiator, ensuring swift thermal transfer away from the CPU copper plate. Despite its high rotational speed, the pump operates at a maximum noise level of just 25 dBA, keeping your system quiet during idle and light tasks. The pump motor is engineered for extreme durability, carrying a rated lifespan of over 210,000 hours of continuous operation.

Comprehensive fan and cooling specifications

Next-generation socket compatibility and six-year warranty

Built for both current and upcoming desktop platforms, this cooler features out-of-the-box mounting support for Intel LGA 1851, 1700, 1200, and 115x sockets, as well as AMD AM5 and AM4 sockets. This broad compatibility ensures a straightforward installation process across a wide range of modern motherboards. To guarantee long-term reliability and performance security, Cooler Master backs the entire assembly with a comprehensive six-year manufacturer warranty.