Radiator splitter Watercool MO-RA X-Splitter for Noctua NF-A20 fans

Watercool MO-RA X-Splitter for Noctua NF-A20 fans is an accessory made to link multiple 200 mm Noctua NF-A20 fans with MO-RA series radiators. It consolidates power and signal lines so several large-diameter fans can be driven and monitored together, reducing cable clutter and simplifying installation in custom PC water-cooling builds that use MO-RA radiators and Noctua NF-A20 fans.

Advantages

The splitter enables grouped fan control and synchronized operation of Noctua NF-A20 fans on MO-RA radiators, improving overall airflow coordination across a large radiator surface. By combining cabling into a single routed connector, it reduces visible wiring and eases fan replacement or maintenance. The design maintains standard fan signal lines so fan speed monitoring and PWM control remain available through a single connection point when supported by the system.

Suitable for

• Custom water-cooling systems using MO-RA series radiators and Noctua NF-A20 200 mm fans
• PC builds that require synchronized speed control for multiple large fans
• Installations where cable management and neat routing across a large radiator are important
• Environments needing simplified fan replacement and maintenance on multi-fan radiator setups

Key specifications

• Compatible fan size: 200 mm (Noctua NF-A20)
• Designed for MO-RA series radiators
• Consolidates multiple fan power and signal lines into grouped routing
• Supports PWM speed control and tachometer signal passthrough where system and fans support it
• Durable connector housings and wiring suitable for PC internal routing

How to use

Install the MO-RA X-Splitter by connecting each Noctua NF-A20 fan cable to the corresponding input on the splitter and route the combined output to the designated fan header or controller on the PC. Ensure connectors are fully seated and oriented correctly to avoid pin misalignment. Verify that the system BIOS or fan controller is configured to recognize PWM- or voltage-based control as applicable for the connected header. After installation, power on the system and check that all connected fans spin and report speed values if tachometer monitoring is used.

Recommendations

For reliable operation, use the splitter with identical Noctua NF-A20 fans to ensure balanced airflow and similar power draw. Avoid exceeding the maximum current rating of the target fan header or controller; if multiple fans draw more current than the header supports, use a dedicated fan controller or powered hub. Route cables to minimize airflow obstruction through the radiator and secure connections to prevent accidental disconnection during maintenance.