Watercool
Watercool MO-RA IV 400
Best external radiator for high-performance custom liquid cooling builds.
The Watercool MO-RA IV 400 is an exceptional radiator designed for high-performance cooling in demanding systems like overclocked gaming PCs, workstations, and servers. Its modular design and extensive expansion capabilities set new benchmarks for cooling efficiency and build quality. Featuring optimized fins for improved airflow across various fan speeds and enhanced stability, this radiator boasts 3.2 square meters of aluminum surface area. It includes a raised pre-chamber for better pressure distribution, 80 pipes totaling 38m in length, and a securely soldered brass connection terminal for superior mechanical load capacity and pressure stability up to 5 bar. User-friendly features like screwless fan mounting simplify installation.
$25.25
Owner Satisfaction
4.7
/ 5
Category Rank
100
/ 3597
#100 in Computer System Cooling Parts
Price vs Category Average
-83%
Below average
Material
Aluminum, Brass
/ Aluminum, Brass
Who it's for
- Power users running multiple high-end GPUs and CPUs
- Silent PC enthusiasts prioritizing near-silent operation
- System builders planning for future high-wattage hardware upgrades
Who should skip it
- Budget-conscious builders prioritizing core component performance
- Users with limited desk or floor space
- Beginners intimidated by complex custom loop plumbing
Performance breakdown
Thermal Dissipation Capacity
Massive surface area handles extreme heat loads with effortless efficiency.
Build Robustness
Soldered brass terminals ensure long-term durability under high pressure.
Installation Convenience
Screwless mounting system makes fan setup remarkably quick and painless.
System Expandability
Modular design allows for seamless integration into complex cooling loops.
Pressure Stability
Engineered to maintain structural integrity at pressures up to five bar.
Airflow Efficiency
Optimized fin geometry delivers consistent performance across all fan speeds.
Key Specs
Material
Aluminum, Brass
Radiator Size
400mm
Pressure Tested
Yes
Max Pressure Stability
5 bar
Surface Area
3.2 square meters
Number of Pipes
80
Total Pipe Length
38m
Fan Mounting
Screwless Quick Mount
Features
- Modular design for versatile expansion and customization
- Optimized fin geometry for improved airflow and stability
- Corrugated fins enhance performance across the fan speed range
- Raised pre-chamber for better pressure distribution
- Firmly soldered brass connection terminal for increased load capacity
- Screwless fan frame and grill mounting for user convenience
- Expandable with optional STAND and WALL MOUNT
- Compatible with flow-optimized MO-RA TANK for multi-pump setups
What customers say
Customers consistently praise the Watercool MO RA IV 400 for its exceptional build quality and unparalleled cooling performance. Users frequently highlight its robust construction and premium materials, ensuring long term reliability. The sheer cooling capacity is a recurring theme, allowing for silent operation even with heavily overclocked systems. While a significant investment, the consensus is that its superior engineering and effectiveness justify the cost, making it a top choice for serious enthusiasts seeking ultimate thermal management.
Know before you buy
The MO-RA IV 400 is an external radiator designed for massive heat dissipation, offering 3.2 square meters of surface area. Unlike internal radiators limited by case size, this unit provides professional-grade cooling capacity for high-end workstations and overclocked systems.
The radiator features a specialized frame and grill system that allows you to snap fans into place without needing individual screws. This simplifies the installation process and makes it much easier to clean or swap out fans later.
Yes, the MO-RA IV 400 is designed to be modular. You can purchase optional stands or wall-mounting brackets to position the radiator outside of your PC chassis for better airflow and aesthetics.
The connection terminal is firmly soldered to the radiator, providing high mechanical load capacity. It is pressure-tested to remain stable up to 5 bar, ensuring it can handle the demands of complex, multi-component custom loops.
Yes, the radiator is compatible with the optional MO-RA TANK. This allows you to mount a pump directly to the unit, which is ideal for multi-pump configurations or simplifying your loop layout.
Yes, the MO-RA IV 400 uses optimized fin geometry and corrugated fins to maintain high cooling efficiency across a wide range of fan speeds. This allows for quiet operation without sacrificing thermal performance.
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