The Cooler Master MasterLiquid Atmos II Stealth 360 delivers high-performance CPU cooling with a completely non-LED, all-black design and a dedicated 4000 RPM VRM fan to manage motherboard power delivery temperatures under heavy workloads. This closed-loop cooler is built for users who want maximum thermal efficiency without any RGB lighting.

Designed for high-performance setups without the RGB distraction

This all-in-one liquid cooler is engineered for PC builders prioritising a clean, stealthy aesthetic. By removing all RGB LEDs, the focus remains entirely on functional design and thermal performance. The matte black finish across the radiator, tubing, and waterblock allows it to blend into any professional workstation or high-end gaming system. This makes it an ideal choice for creators, developers, and gamers who prefer a distraction-free environment.

Active VRM cooling for stable motherboard power delivery

Unlike standard liquid coolers that only target the CPU, this unit features a dedicated VRM fan built directly into the waterblock assembly. Measuring 85 x 78.5 x 25.5 mm, this fan operates at speeds ranging from 690 to 4000 RPM (±10%), pushing air directly over the motherboard power phases. Generating up to 2.8 mmH2O of static pressure and 15.8 m³/h of airflow, this active cooling solution helps prevent thermal throttling on high-end motherboards during extended rendering sessions or heavy computational tasks.

High-pressure Mobius 120P fans and a 360mm radiator

The thermal load from the CPU is transferred to a 360mm aluminium radiator measuring 394 x 119.2 x 29 mm. Heat dissipation is handled by three Mobius 120P fans. These 120mm fans utilise Loop Dynamic Bearings and operate from 0 up to 2400 RPM (±10%). Each fan is capable of producing 75.2 CFM of airflow and a high static pressure of 3.63 mmH2O, forcing air through the radiator fins to keep coolant temperatures low. Even at maximum speed, the fans keep noise levels to a maximum of 30 dBA.

Engineered for long-term reliability and customisable stealth aesthetics

At the core of the cooling loop is a pump operating at 3400 RPM (±300 RPM) with a maximum noise output of 25 dBA. The pump is rated for an MTTF of over 210,000 hours, ensuring long-term operation under continuous load. Connection to the motherboard is simple via a 4-pin PWM connector, allowing for precise speed curves based on system temperatures. The waterblock features a Flex Kit Customisation pack, which provides interchangeable Base, Metallic, and VRM Fan covers so you can subtly adjust the physical look of the block to match your build’s theme.

Broad socket support and a six-year warranty

CryoFuze thermal paste ensures optimal heat transfer from the processor integrated heat spreader to the copper cold plate. The cooler features 400mm of durable tubing to accommodate large PC cases and dual-chamber chassis layouts. Out-of-the-box mounting brackets provide wide compatibility across modern desktop platforms. Cooler Master backs this unit with a six-year warranty.

Supported Intel Sockets	LGA 1851, LGA 1700, LGA 1200, LGA 1150, LGA 1151, LGA 1155, LGA 1156
Supported AMD Sockets	AM5, AM4
Radiator Dimensions	394 x 119.2 x 29 mm
Tubing Length	400 mm